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Back to SIP Services

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In this section:

Table of Contents

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A profile allows you to create a specific set of characteristics different from the standard

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0product
defaults. When defining a new instance of one of these objects, simply use the profile to quickly customize the values. A brief summary of SIP profiles is provided below.

SIP ARS Profile

To achieve efficient device failover to the backup/secondary Application Server, the

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0product
uses the Address Reachability Service (ARS) to determine if a server is reachable, providing the ability to "blacklist" a server IP address if it is found to be unreachable, as well as the ability to remove the server from the blacklisted state. ARS profiles can be created to configure blacklisting and recovery algorithm variants.

These ARS profiles can be assigned to the services section of a SIP trunk group to enforce the blacklisting and recovery of any SIP peer(s) associated with the trunk group. If no recovery algorithm is specified when configuring a SIP ARS profile, the recovery algorithm default values are used as indicated below:

  • recoveryAlgProbeDuration: 1 second
  • recoveryAlgProbeInterval: 1 second
  • recoveryAlgProbeMethod: sip-options
  • recoveryAlgProbeNumResponses: 1
  • recoveryAlgTimerDuration: 1 second
  • recoveryAlgorithm: probe

...

Refer to the following pages for configuration details:

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SIP Call Admission Control Profile

The

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0product
provides call and registration admission control for SIP calls and SIP registrations at the zone level, SIP trunk group level, and SIP endpoint level. For more information

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.

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Refer to the following pages for configuration details:

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SIP/CPC Cause Code Mapping Profiles

The Cause Map Profile, SIP-to-CPC and CPC-to-SIP mappings provide customized tables on the

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0product
to map cause codes between SIP and Q.850 cause codes. Previously, these mappings were hard coded in the
Spacevars
0product
. The custom mappings can be selected on a per route basis on egress trunks and ingress trunks on the
Spacevars
0product
.

Excerpt
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titleInfo

The

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0series4
supports up to 64 SIP-to-CPC and 64 CPC-to-SIP cause code mapping profiles.

The following IPSP configurations are added to PSX under SIP Cause Mapping section to specify the Cause Code Mapping profile name.

  • Internal to SIP Cause Mapping Profile Name
  • SIP to Internal Cause Mapping Profile Name

The PSX returns the Cause Code profile name in the POL responses. The 

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0product
uses the Cause Code profile specified by PSX. If PSX fails to provide the Cause Code profile, the 
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0product
uses the local Cause Code Mapping profile configured on the SIP Trunk Group.

The 

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0product
applies the Cause Code Mapping profile in the following order:

  1. If a policy response contains a profile name and a locally configured profile uses the same name, the 

    Spacevars
    0product
    applies the same name.

  2. If a policy response does not contain a profile name or if the profile name does not match with any local profile, the 

    Spacevars
    0product
    applies the SIP Trunk Group created local profile name (if created).

  3. The 

    Spacevars
    0product
    applies a default profile name if none of the above two cases match.

...

See the following pages for configuration details:

SIP Emergency Call Profile

This object creates and configures an Emergency Call Profile for SIP calls used to host emergency call criteria. The emergency call classification methods are:

  • Emergency Call Marking: The cpc-priority in P-Asserted Identities is present in the INVITE message, and the CPC parameter of the SIP EMERGENCY PROFILE is set to “priority”.
  • Prefix Matching (up to three prefixes): At least one of the three emergency prefixes is configured in SIP EMERGENCY PROFILE and the R-URI header in the INVITE message matches one of the three emergency prefixes. The emergency prefix is an alphanumeric string that consists of numeric digits (phone number). For more information see Call Admission Controls topic.
  • URN Prefix: Emergency prefix URN, for example “services:sos”.
  • X-EMG Header: Use this flag to determine whether SIP X-EMG header should be accepted as an emergency call indicator.

See the following pages for configuration details:

SIP JIP Profile

 

Note
JIP is only supported when using an external PSX in the network.

The Jurisdiction Information Parameter (JIP) is a 6-digit field (NPA-NXX format) in an IAM message to indicate the geographic location of the originating caller or switch.

The inclusion of the JIP parameter in SIP INVITE message allows the 

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0product
to support interworking of Jurisdiction information (JIP) for SIP-SIP and SIP-SIP-I, and vice versa, including GW-GW by sending and receiving JIP in the PAI/FROM/PDCS header. The SBC can interwork JIP across gateway to GSX as well.

JIP information can be carried in the P-Asserted-ID/FROM and P-DCS-Billing-Info headers of SIP INVITE message and in the PDCS header in a 3xx response. The

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0product
records JIP-related details in the Call Detail Record.

Multiple controls can be enabled at a time to select the header or parameter from which JIP value will be extracted. When multiple controls are configured, JIP information is extracted in the following order:

  • RN PARAMETER IN PAI
  • JIP PARAMETER IN PAI
  • RN PARAMETER IN FROM
  • JIP PARAMETER IN PDCS

See the following pages for configuration details:

SIP OCSP Profile

The Online Certificate Status Protocol (OCSP) enables

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0product
applications to determine the revocation status of a given certificate. OCSP is used to satisfy some of the operational requirements of providing timely revocation information.

When a peer sends certificates, an OCSP client (e.g. SIPFE) issues a status request to an OCSP responder and suspends acceptance of the certificates in question until the responder provides a response. The OCSP client needs the address/URL of the OCSP responder, the certificate to be checked, and the certificate issuer’s certificate. The OCSP URL can be FQDN or IPv4 address plus port number.

The

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0product
supports adding OCSP configuration to an existing/new TLS profile, and performing automatic OCSP checking in OpenSSL library without making substantial changes to OCSP clients (SIPFE, etc.). The OCSP clients may be involved when OCSP checking returns errors. The user may create up to four OCSP profiles per system as described in "Key Concepts" section below.

The

Spacevars
0product
can act in TLS server role as well as TLS client role.

  • As a TLS server with Client Authentication enabled, the
    Spacevars
    0product
    checks OCSP status when the TLS client sends its certificate chain to the
    Spacevars
    0product
    . Upon receiving Certificate Verify from client, the
    Spacevars
    0product
    performs OCSP status checking for each certificate in the chain after validating signature, expiration time, etc. for each certificate in the chain.
  • When acting as a TLS client, SBC checks OCSP status when the peer TLS server sends its certificate chain to the
    Spacevars
    0product
    . The
    Spacevars
    0product
    then performs OCSP status checking for each certificate in the chain.
Note

The

Spacevars
0product
integrates OCSP status-checking as a part of certificate validation in OpenSSL library.

Key Concepts

The user may create up to four OCSP profiles per system, each specifying the OCSP capabilities and protocol parameters applying to one or more TLS connections that use the profile (a SIP/TLS connection may reference an OCSP profile in its assigned TLS profile). The OCSP profile is referenced by the existing TLS profile.

  • OCSP capability
    • enabled
    • disabled (default)
  • Default responder URI (default: blank):
    • IPv4 address and port number, or
    • FQDN
  • AIA override:
    • enabled - Forces the use of configured Default responder for OCSP validation regardless of whether or not the certificate being validated references a responder by AIA.
    • disabled (default) - The responder referenced via AIA by the certificate being validated is used, or the Default responder as configured is used only if the AIA is not available.
  • OCSP response waiting time - If the corresponding OCSP response does not return before the time expires after sending an OCSP request, the response is considered unavailable.
    • Range: 1-16 seconds, default = 2.
Note
The configured default responder may point to the certificate authority (CA) that issued the certificate in question, a Trusted Responder whose public key is trusted by the
Spacevars
0product
, or a CA Authorized Responder (or Delegated Trust Responder in UCR term) that is designated by one or more CAs.

When configuring an OCSP profile, be aware that you may delete a given OCSP profile when it is not referenced by any TLS connections.

When OCSP is enabled for a TLS connection, every individual certificate in the chain presented by the peer device during the establishment of the connection is validated against an OCSP responder for its revocation status.

...

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0product

...

The

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0product
supports SIP Cause Code Mapping for CPC to SIP for trunk groups regardless of the signaling zone.

Info
titleNote

The

Spacevars
0product
does not support SIP Cause Code Mapping for CPC to SIP for trunk groups if the PSX enables the SIP_IN_CORE flag.

The PSX sends the SIP_USED_IN_CORE flag with the policy response to the egress

Spacevars
0product
. If the egress
Spacevars
0product
receives the SIP_USED_IN_CORE flag and the ingress zone of the egress
Spacevars
0product
is in the default signaling zone, the egress
Spacevars
0product
does not allow SIP Cause Code Mapping for CPC to SIP because the scenario is SIP In Core. If the PSX either is not present or does not enable the SIP_IN_CORE flag, then SIP Cause Code Mapping for CPC to SIP functions as if the
Spacevars
0product
uses a non-default signaling zone. The following figure illustrates the SIP In Core call flow.

Info
titleNote

This SIP Cause Code Mapping for CPC to SIP function does not impact GW-GW call scenarios.

Caption
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1SIP In Core Call Flow

Image Added

 

When the call flow uses a single

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0product
, the PSX always disables the SIP_IN_CORE flag and the SIP Cause Code Mapping for CPC to SIP occurs whether or not the
Spacevars
0product
uses the default signaling zone.

The following figure illustrates the I-

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0product
call flow.
Caption
0Figure
1I-SBC Call Flow

Image Added

 

Refer to the following pages for configuration details:

SIP Emergency Call Profile

This object creates and configures an Emergency Call Profile for SIP calls used to host emergency call criteria. The emergency call classification methods are:

  • Emergency Call Marking: The cpc-priority in P-Asserted Identities is present in the INVITE message, and the CPC parameter of the SIP EMERGENCY PROFILE is set to “priority”.
  • Prefix Matching (up to three prefixes): At least one of the three emergency prefixes is configured in SIP EMERGENCY PROFILE and the R-URI header in the INVITE message matches one of the three emergency prefixes. The emergency prefix is an alphanumeric string that consists of numeric digits (phone number). For more information refer to Call Admission Controls.
  • URN Prefix: Emergency prefix URN, for example “services:sos”.
  • X-EMG Header: Use this flag to determine whether SIP X-EMG header should be accepted as an emergency call indicator.

Refer to the following pages for configuration details:

SIP JIP Profile

Info
titleNote

JIP handling is only supported when using an external PSX in the network.

The Jurisdiction Information Parameter (JIP) is a 6-digit field (NPA-NXX format) in an ISUP IAM message used to indicate the geographic location of the originating caller or switch. This information may be used in billing. 

The SBC supports sending JIP information in SIP-SIP, SIP-SIP-I and SIP-I to SIP scenarios. This capability is enabled/disabled through the SIP Jurisdiction Support option (sipJurisdictionSupport flag) set in the SIP trunk group, and specific processing details are controlled through the SIP JIP profile assigned to the trunk group.

When SIP Jurisdiction support is enabled, options in the SIP JIP profile assigned to the ingress SIP trunk group specify where to extract the SIP JIP value from in an incoming SIP INVITE message. The SBC can take the JIP value from the following parameters:

  • rn parameter in the PAI header
  • jip parameter in the PAI header
  • rn parameter in the From header
  • jip parameter in the P-DCS-Billing-Info header

Note that if a SIP JIP profile enables more than one possible source parameter, the SBC prioritizes them in the order shown above.

The SBC sends the JIP value it extracts to the external PSX. Based on its configuration, the PSX determines what JIP value should be sent out and returns this value to the SBC.

In the outgoing message, the SBC sends the JIP it received from the PSX in the parameter specified in the SIP JIP profile assigned to the egress SIP trunk group. The parameter options are the same as the source choices:

  • rn parameter in the PAI header
  • jip parameter in the PAI header
  • rn parameter in the From header
  • jip parameter in the P-DCS-Billing-Info header

For cases when the JIP value is sent in a P-DCS-Billing-Info header, the SIP trunk group also includes a parameter (feidForPDCS) in which you can specify a Financial-Entity-ID (FEID) to be sent out in the egress PDCS-Billing-Info header. An FEID consists of hexadecimal string of up to 16 characters followed by a domain name. 

The SBC records JIP-related details in the Call Detail Record.

Refer to the following pages for configuration details:

SIP OCSP Profile

The Online Certificate Status Protocol (OCSP) enables

Spacevars
0product
applications to determine the revocation status of a given certificate. OCSP is used to satisfy some of the operational requirements of providing timely revocation information.

When a peer sends certificates, an OCSP client (e.g. SIPFE) issues a status request to an OCSP responder and suspends acceptance of the certificates in question until the responder provides a response. The OCSP client needs the address/URL of the OCSP responder, the certificate to be checked, and the certificate issuer’s certificate. The OCSP URL can be FQDN or IPv4 address plus port number.

The

Spacevars
0product
supports adding OCSP configuration to an existing/new TLS profile, and performing automatic OCSP checking in OpenSSL library without making substantial changes to OCSP clients (SIPFE, etc.). The OCSP clients may be involved when OCSP checking returns errors. The user may create up to four OCSP profiles per system as described in "Key Concepts" section below.

The

Spacevars
0product
can act in TLS server role as well as TLS client role.

  • As a TLS server with Client Authentication enabled, the
    Spacevars
    0product
    checks OCSP status when the TLS client sends its certificate chain to the
    Spacevars
    0product
    . Upon receiving Certificate Verify from client, the
    Spacevars
    0product
    performs OCSP status checking for each certificate in the chain after validating signature, expiration time, etc. for each certificate in the chain.
  • When acting as a TLS client, SBC checks OCSP status when the peer TLS server sends its certificate chain to the
    Spacevars
    0product
    . The
    Spacevars
    0product
    then performs OCSP status checking for each certificate in the chain.
Info
titleNote

The

Spacevars
0product
integrates OCSP status-checking as a part of certificate validation in OpenSSL library. 

Key Concepts

The user may create up to four OCSP profiles per system, each specifying the OCSP capabilities and protocol parameters applying to one or more TLS connections that use the profile (a SIP/TLS connection may reference an OCSP profile in its assigned TLS profile). The OCSP profile is referenced by the existing TLS profile.

  • OCSP capability
    • enabled
    • disabled (default)
  • Default responder URI (default: blank):
    • IPv4 address and port number, or
    • FQDN
  • AIA override:
    • enabled - Forces the use of configured Default responder for OCSP validation regardless of whether or not the certificate being validated references a responder by AIA.
    • disabled (default) - The responder referenced via AIA by the certificate being validated is used, or the Default responder as configured is used only if the AIA is not available.
  • OCSP Stapling
    • disabled (default)
    • enabled
  • OCSP response waiting time - If the corresponding OCSP response does not return before the time expires after sending an OCSP request, the response is considered unavailable.
    • Range: 1-16 seconds. Default: 2.
  • OCSP Response Caching Timer
    • Range: 1-30 days. Default: 1.
Info
titleNote

The configured default responder may point to the certificate authority (CA) that issued the certificate in question, a Trusted Responder whose public key is trusted by the

Spacevars
0product
, or a CA Authorized Responder (or Delegated Trust Responder in UCR term) that is designated by one or more CAs. 

 

When configuring an OCSP profile, be aware that you may delete a given OCSP profile when it is not referenced by any TLS connections.

When OCSP is enabled for a TLS connection, every individual certificate in the chain presented by the peer device during the establishment of the connection is validated against an OCSP responder for its revocation status.

When the

Spacevars
0product
is upgraded from a release which already supports OCSP, all the parameter values of existing OCSP profiles are retained after the upgrade completes.

OCSP Stapling

Caption
0Table
1SBC as a Server or Client
When this ICD refers to the SBC as a... This term means the SBC...
Client Initiates the TCP/TLS connection
Server Accepts the TCP/TLS connection
The 
Spacevars
0product
supports Online Certificate Status Protocol (OCSP) stapling (refer to RFC 6961), which allows you to provide the validity information of your security certificate. With OCSP stapling, the client does not need to query the OCSP responder to retrieve the certificate status.

Info
titleNote

OSCP stapling supports the following interworking scenarios:

  • UDP-TLS
  • TLS-UDP
  • TCP-TLS
  • TLS-TCP

The

Spacevars
0product
that acts as a server checks if the OCSP response is available in the OCSP cache before the
Spacevars
0product
queries the OCSP server. If the OCSP response is available in the OCSP cache, the 
Spacevars
0product
uses that OCSP response to send the response as a certificate status message. If the OCSP response is not available in the OCSP cache, the
Spacevars
0product
queries the OCSP server to receive the OCSP response.

If the ingress peer sends a ClientHello with the "status_request: OCSP" status request extension to the

Spacevars
0product
(as a server) and you

  • enable the ocspStapling flag in the ingress OCSP profile, the

    Spacevars
    0product
    sends an OCSP request to the OCSP responder and receives the OCSP response. The
    Spacevars
    0product
    stores the OCSP response in the OCSP cache before it sends the OCSP response as a certificate status message to the ingress peer.

    Info
    titleNote

    The

    Spacevars
    0product
    does not send a certificate status message to the client when the
    Spacevars
    0product
    receives a failure response from the OCSP responder. The client must use another mechanism to verify the validity of the server certificate.

  • disable the ocspStapling flag in the ingress OCSP profile, the
    Spacevars
    0product
    does not send a certificate status message to the ingress peer. The
    Spacevars
    0product
    ignores the OCSP status extension.
Info
titleNote

The ocspStapling flag automatically disables if the ocspProfile state flag is disabled.

Info
titleNote

The ClientHello is the first message the ingress peer sends to the

Spacevars
0product
while the ingress peer initiates the Transport Layer Security (TLS) connection to the
Spacevars
0product
.

When the

Spacevars
0product
enables mutual authentication and receives a ClientHello with the "status_request: OCSP" status request extension, the
Spacevars
0product
sends the client the OCSP response as a certificate status message.

If the ingress peer sends a ClientHello with the "status_request: OCSP" status request extension, and both mutual authentication and the ocspStapling flag are enabled in the ingress OCSP profile, the

Spacevars
0product
sends an OCSP request to the OCSP responder and receives the OCSP response. The
Spacevars
0product
then sends the OCSP response as a certificate status message to the ingress peer.

When the

Spacevars
0product
acts as a client and you enable the ocspStapling flag in the egress OCSP profile, the
Spacevars
0product
sends a ClientHello with the "status_request: OCSP" status request extension to the egress TLS peer. When the
Spacevars
0product
acts as a client and you disable the ocspStapling flag in the egress OCSP profile, the
Spacevars
0product
does not send a ClientHello with the "status_request: OCSP" status request extension to the egress TLS peer.

When the

Spacevars
0product
acts as a client, the
Spacevars
0product
checks the certificate status message received from the server for the validity of the server certificate. If the server certificate status is

  • good, the
    Spacevars
    0product
    establishes a TLS connection with the egress peer.
  • revoked, the
    Spacevars
    0product
    does not establish a TLS connection with the egress peer.
  • unknown, the
    Spacevars
    0product
    establishes a TLS connection with the egress peer and logs a major log that indicates the status is unknown in the debug file.

The following figure illustrates the OCSP stapling call flow.

Caption
0Figure
1OCSP Stapling Call Flow

Image Added

Linux DNS Client Support

Linux DNS client functionality is required for OpenSSL OCSP API to translate a FQDN to an IPv4 address. To populate the file with DNS server addresses, use following CLI commands.

Code Block
% set addressContext default dnsGroup d1 type mgmt server dns1 ipAddress 10.11.12.13 state enabled
% set addressContext default dnsGroup d1 type mgmt server dns2 ipAddress 10.11.12.15 state enabled

...

Info
titleNote

Existing DNS CLIs add dynamic ACLs for the configured DNS servers. 

 

...

Refer to the following pages for command details:

SIP Security Profile

The SIP Security Profile feature defines the type and behavior of security mechanism to apply to the

Spacevars
0product
acting as P-CSCF.

...

Refer to the following pages for command details:

Transparency Profile

Include Page
Transparency_Profile_Note
Transparency_Profile_Note

The

Spacevars
0product

...

 supports flexible header transparency feature which allows a user to define a set of SIP header names using a configuration interface to the Transparency Profile (TP), and then assign that profile to a Trunk Group (TG). For example, if a header name is in the TP corresponding to the egress leg (respective to the message), it is passed through unmodified with its full content, including all parameters. This applies to all initial INVITE, REGISTER and mid-INVITE initiated dialog requests and responses (excluding mid-dialog SUBSCRIBE requests and responses sent in the context of an existing dialog). Corresponding relay flags for other mid-dialog requests (e.g. INFO, MESSAGE, NOTIFY) must be enabled for this functionality to work.

...

Info
titleNote

Headers are also configurable in compact form, and may be transparently passed by configuring a Transparency Profile. It is advisable to configure both compact and long formats to ensure both types of received headers in the PDU are transparently passed. 

 

If a header is not in the transparency configurable, existing “Unknown Header Transparency” and explicit header transparency flag semantics shall apply.

This feature allows you to add previously “unknown” headers to the TP making them “semi-known” to the system, as well as add “known” headers thus eliminating the need for IP Signaling Profile (IPSP) transparency control flags for those headers. An "unknown" header is defined as a header that, if present in an incoming SIP message, is parsed as a generic “unknown” header, but is treated as a “known” header with respect to transparency by allowing individual transparency control towards it.

This dynamic transparency capability applies to SIP-SIP, SIP-GW and GW-SIP scenarios. GW-GW is supported only between the same GW versions.

If you configure a Contact header in the Transparency Profile, it is treated as full contact header transparency.

Support for known headers (with or without IPSP transparency flags) is available for INVITE, REGISTER and OOD messages. Support for selective unknown header transparency is available for INVITE, REGISTER messages.

The following message body headers cannot be used when configuring a Transparency Profile:

  • Content-Encoding
  • Mime-Version
  • Content-Disposition

The

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0product
supports configuring up to 256 Transparency Profiles. By default, no headers are present in the Transparency Profile.

Info

...

titleNote

Do not enable "unknownHeader" flag if using this feature. 

 

...

Refer to the following pages for command details:

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