The SBC Core supports the SIP headers listed in this section.

 

Note

The SBC supports up to 20 parameters per SIP header to accommodate enhanced services such as IMS and VoLTE using call flows such as ICS and SRVCC.

IMPORTANT

The Transparency Profile is the recommended method of configuring transparency on the SBC Core for new deployments as well as when applying additional transparency configurations to existing deployments. Do not use IP Signaling Profile flags in these scenarios because the flags will be retired in upcoming releases.

Refer to the SBC SIP Transparency Implementation Guide for additional information.

 

Note

The SBC treats User-Agent and Server headers as known headers beginning in release 4.1.0. The SBC accepts these headers based on ABNF grammar format and restricts them to a maximum of 10 server-vals. You must explicitly turn ON these headers for transparency. Additionally, if a header requires more than 10 server-vals in compliance with ABNF grammar, the header must convert to an unknown header using SMM.

SIP provides a mechanism to represent common header field names in an abbreviated form. This may be useful when messages are too large to be carried on the transport available to it. A compact form may be substituted for the longer form of a header field name at any time without changing the semantics of the message. A header field name may appear in both long and short forms within the same message. A compact form of some common header field names is also defined for use when overall message size is an issue. Any headers marked with an alternate like: ' | ' indicates the long form or the short form of the header.

In order to maintain backward capability, as of 4.1.6R0 and 4.2.4R0 releases, the SBC relaxes the ABNF grammar formatting to allow invalid syntax server-vals plus an unlimited number of server-vals for these two headers.

 

The SBC does not process or send the Date header natively. If you need to pass the Date Header transparently, use the SBC’s Header Transparency feature.

 

SIP Header List

 

Key:

(tick) = Supported
(error) = Not supported

 

 

A

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Accept(tick)(tick) 
Accept-Contact|a(tick)(tick) 
Accept-Language(tick)(tick)4.0.0
Accept-Resource-Priority(tick)(tick) 
Alert-Info (tick)(tick) 
Allow(tick)(tick) 
Also(tick)(tick) 
Anonymity(tick)(tick) 
Authorization(tick)(tick) 

 

C

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
CallConnectId(tick)(tick) 
Call-ID|i(tick)(tick) 
Call-Info(tick)(tick) 
Contact|m(tick)(tick) 
Content-Disposition(tick)(tick) 
Content-Type|c(tick)(tick) 
Content-Encoding|e(tick)(tick) 
Content-Length|l(tick)(tick) 
CSeq(tick)(tick) 

 

D

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Diversion(tick)(tick) 

 

E

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Error-Info (tick)(tick) 
Event|o(tick)(tick) 
Expires(tick)(tick) 

 

F

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Feature-Caps(tick)(tick)5.1.0
Flow-Timer(tick)(error)4.0.0
From|f(tick)(tick) 

 

G

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Geolocation(tick)(tick) 
Geolocation-Error(tick)(tick) 
Geolocation-Routing(tick)(tick) 

 

H

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
History-Info(tick)(tick) 

 

I

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Identity(tick)(tick) 7.2.0
Info-Package(tick)(tick) 5.1.0

 

M

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Max-Forwards(tick)(tick) 
MIME-Version(tick)(tick) 
Min-Expires(tick)(tick) 
Min-SE(tick)(tick) 

 

O

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Overload-Control(tick)(tick) 

 

P

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
P-Access-Network-Info(tick)(tick) 
P-Area-Info(tick)(tick) 
P-Asserted-Identity(tick)(tick) 
P-Associated-URI(tick)(tick) 
P-Attestation-Indicator(tick)(tick)7.2.0
Path(tick)(tick) 
P-Asserted-Service(tick)(error)5.1.0
P-Called-Party-ID(tick)(tick) 
P-Carrier-Info(tick)(tick) 
P-CDR-Info (tick)(tick) 
P-Charge-Info(tick)(tick) 
P-Charging-Function-Addresses (tick)(tick) 
P-Charging-Vector(tick)(tick) 
P-ChgMsg-Info(tick)(tick) 
P-Com.Session-Info(error)(tick)5.1.0
P-DCS-Billing-Info(tick)(tick)4.0.0
P-DCS-LAES (error)(tick) 
P-Early-Media(tick)(tick) 
"P-K-Adn"(tick)(error) 
P-K-Cfl(tick)(tick) 
P-K-Cfo(tick)(tick) 
P-Orig-CA(tick)(tick) 
P-Origination-ID(tick)(tick)7.2.0
P-Preferred-Identity(tick)(tick) 
P-Profile-Key(tick)(tick)5.1.0
Privacy(tick)(tick) 
Proxy-Authenticate(tick)(tick) 
Proxy-Authorization(tick)(tick) 
Proxy-Require(tick)(tick) 
P-Sig-Info (tick)(tick) 
P-Svc-Info (tick)(tick) 
P-Term-CA(tick)(tick) 
P-Visited-Network-ID(tick)(tick) 
    

 

R

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
RAck(tick)(tick) 
Reason(tick)(tick) 
Record-Route(tick)(tick) 
Recv-Info(tick)(tick)5.1.0
Referred-By|b(tick)(tick) 
Refer-Sub(tick)(tick)4.0.0
Refer-To|r(tick)(tick) 
Remote-Party-ID(tick)(tick) 
Replaces(tick)(tick) 
Reply-To(tick)(tick) 
Requested-By(tick)(tick) 
Require(tick)(tick) 
Resource-Priority(tick)(tick) 
Retry-After(tick)(tick) 
Route(tick)(tick) 
RSeq(tick)(tick) 

 

S

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Security-Client(tick)(tick) 
Security-Server(tick)(tick) 
Security-Verify(tick)(tick) 
Server(tick)(tick)4.0.0
Service-Route(tick)(tick) 
Session-Expires|x(tick)(tick) 
Sip-Etag(tick)(tick)4.0.0
Sip-If-Match(tick)(tick)4.0.0
Subscription-State(tick)(tick) 
Supported|k(tick)(tick) 
Suppress-If-Match(tick)(tick)4.0.0

 

T

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Target-Dialog(tick)(tick) 
Timestamp (tick)(tick) 
To|t(tick)(tick) 

 

U

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
UnSupported(tick)(error) 
User-Agent(tick)(tick)4.0.0
User-to-User(tick)(tick) 

 

V

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Via|v(tick)(tick) 

 

W

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
Warning (tick)(tick)4.0.0
WWW-Authenticate(tick)(tick) 

 

X

Click here to view/hide table: 

 

SIP Header

Supported Feature
Release Added
(since 3.1.7)
SendReceive and Process
X-ATP(tick)(tick) 
X-AUT(tick)(tick) 
X-BCI(tick)(tick) 
X-CALLING-NUM(tick)(tick) 
X-Carrier-Info(tick)(tick) 
X-CHGDelay(tick)(tick) 
X-CHGInfo (tick)(tick) 
X-CONTRACT-ADDR(tick)(tick) 
X-EMG(tick)(tick) 
X-FCI(tick)(tick) 
X-FWDORIG-NUM(tick)(tick) 
X-GENERIC-NUM(tick)(tick) 
X-ISUPEvent(tick)(tick) 
X-ISUPMtype(tick)(tick) 
X-NOCI(tick)(tick) 
X-OBCI(tick)(tick) 
X-ORIGCLD-NUM(tick)(tick) 
X-REDBWDINF(error)(tick) 
X-REDCAP(tick)(tick) 
X-REDCNT(tick)(tick) 
X-REDFWDINF(tick)(tick) 
X-Service-Indicator(tick)(tick) 
X-Service-Type(tick)(tick) 
X-TMR(tick)(tick) 
X-USI(tick)(tick)