Configuring Dynamic Policies and Routing Using Flexible Policy and Routing Feature

In this section:

Route Based on "phone-context" Parameter Received in SIP Invite Message

Sample SIP INVITE

INVITE sip:9886001123;phone-context=enterprise-1.net@10.7.15.143:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.6.56:5060;branch=z9hG4bK-1-0
From: <sip:+16031234567@10.7.6.56:5060>;tag=1
To: sut <sip:9886001123@10.7.15.143:5060>
Call-ID: 1-18533@10.7.6.56
Cseq: 1 INVITE
Contact: <sip:6203215002@10.7.6.56:5060>
Max-Forwards: 70
Subject: Performance Test
P-Charging-Vector:
 
icid-value=3cbeb620-0001-1000-00-0000-10-6b-00-02-20;icid-generated-at=10.10.10.10;orig-ioi=1234;term-ioi=4567
Record-Route: <sip:6203215002@10.7.6.56:5060;lr;x-ep-index=1>
Allow: INVITE,ACK,CANCEL,BYE,REGISTER,REFER,INFO,SUBSCRIBE,NOTIFY,PRACK,UPDATE,OPTIONS,MESSAGE,PUBLISH
Require: timer
Supported: timer
Min-SE: 90
Session-Expires:90;refresher=uas
Content-Type: application/sdp
Content-Length: 125
v=0 
o=user1 53655765 2353687637 IN IP4 10.7.6.56
s=-
c=IN IP4 10.7.6.56
t=0 0
m=audio 22222 RTP/AVP 0 8 18
a=sendrecv

SBC Configuration

Create flexible policy rules and apply to SBC:

Rule 1
# This rule supports flexible policy to route calls based upon "phone-context" parameter 
# in Request-URI of incoming INVITE
#set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1
# criteria 1: Message
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT profileType flexiblePolicy
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 criterion 1 type message
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 criterion 1 type message message messageTypes request
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 criterion 1 type message message methodType invite
# criteria 2: header
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 criterion 2 type header
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 criterion 2 type header header condition exist
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 criterion 2 type header header name request-line
# configure the parameter criteria
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 criterion 3 type parameter
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 criterion 3 type parameter
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 criterion 3 type parameter parameter condition exist
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 criterion 3 type parameter parameter paramType userinfo
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 criterion 3 type parameter parameter name phone-context
# action 1 - store policy/routing string into messageScope variable(var1)
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 action 1 type parameter
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 action 1 operation store
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 action 1 paramType userinfo
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 action 1 to type variable variableValue var1 variableScopeValue message
set profiles signaling sipAdaptorProfile FP_PHONE_CONTEXT rule 1 action 1 from type parameter value phone-context

Flexible policy rules can be associated either with the Ingress Zone or the Ingress Trunk Group:

To associate flexible policy rules with the Ingress Zone:

set addressContext defaultAddressContext zone ZONE_IAD flexiblePolicyAdapterProfile FP_PHONE_CONTEXT

To associate flexible policy rules with the Ingress Trunk Group:

set addressContext defaultAddressContext zone ZONE_IAD sipsTrunkGroup IAD_TG signaling flexiblePolicyAdapterProfile FP_PHONE_CONTEXT

SBC extracts the value of the phone-context parameter and stores it into var1, which is passed in policy request to PSX.

PSX Configuration

Create Flexible Variable Rules

Figure 1: Creating Flexible Variable Rules

Assign Flexible Variable Rules to Ingress Trunk Group

Figure 2: Assign Flexible Variable Rules to Ingress Trunk Group

Configuring Flexible Routing by Using Call Processing Element Type and/or Call Parameter Filter Profile

Using Call Processing Element Types to Apply Flex Routing

Modify Element Routing Priority to Use Flex Routing Call Processing Element Type in Standard Route Configuration

Figure 3: Modify Element Routing Priority

Associate Element Routing Priority with Trunk Group to Use Flex Routing Call Processing Element type in Standard Route Configuration

Figure 4: Associate Element Routing Priority Profile to Trunk Group

Create Standard Routes Using Call Processing Element Types to Apply Flex Routing

Figure 5: Create Standard Routes

Figure 6: Create Standard Routes

The two standard routes above result in the following Routing Label selection:

PHONE_CONTEXT_R1 will be returned if Flex variable V1 is populated with the value "enterprise-1.net"
PHONE_CONTEXT_R2 will be returned if Flex variable V1 is populated with the value "enterprise-2.net"

Create Standard Routes using Call Parameter Filter Profile to Apply Flexible Routing

In addition to the Call Processing Element types, a Call Parameter Filter Profile may be applied to a Standard Route to match/filter flexible routing criteria.

Figure 7: Create Standard Routes using Call Parameter Filter Profile

The standard route above results in Routing Label selection:

PHONE_CONTEXT_R3 is returned, if Flex variable V1 is populated with the value "enterprise-3.net".

Apply Policy Based on the Presence of the AMR or AMR-WB Codec in a SIP Invite SDP

Sample SIP INVITE

INVITE sip:9886001123@10.7.15.143:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.6.57:5060;branch=z9hG4bK-1-0
From: <sip:+16031234567@10.7.6.57:5060>;tag=1
To: sut <sip:9886001123@10.7.15.143:5060>
Call-ID: 1-28012@10.7.6.57
Cseq: 1 INVITE
Contact: <sip:6203215002@10.7.6.57:5060>
Max-Forwards: 70
Subject: Performance Test
P-Charging-Vector:
 
icid-value=3cbeb620-0001-1000-00-0000-10-6b-00-02-20;icid-generated-at=10.10.10.10;orig-ioi=1234;term-ioi=4567
Record-Route: <sip:6203215002@10.7.6.57:5060;lr;x-ep-index=1>
Allow: INVITE,ACK,CANCEL,BYE,REGISTER,REFER,INFO,SUBSCRIBE,NOTIFY,PRACK,UPDATE,OPTIONS,MESSAGE,PUBLISH
Require: timer
Supported: timer
Min-SE: 90
Session-Expires:90;refresher=uas
Content-Type: application/sdp
Content-Length: 154
v=0 
o=user1 53655765 2353687637 IN IP4 10.7.6.57
s=-
c=IN IP4 10.7.6.57
t=0 0
m=audio 22222 RTP/AVP 0 8 18 99
a=rtpmap:99 AMR-WB/16000
a=sendrecv

SBC Configuration

Create Flexible Policy Rules and Apply to SBC

#
# These rules support flexible policy based upon whether specific codecs (AMR or AMR-WB) 
# appears in the SDP of incoming INVITE message. 
# var2: 0, if neither "AMR" nor "AMR-WB" present in SDP.
# AMR, if "AMR" present and "AMR-WB" is not present in SDP.
# AMR-WB, if "AMR-WB" present in SDP.
#
# rule 1: initialize variable var2 to "0"
set profiles signaling sipAdaptorProfile FP_CODEC profileType flexiblePolicy
set profiles signaling sipAdaptorProfile FP_CODEC rule 1 criterion 1 type message message messageTypes request
set profiles signaling sipAdaptorProfile FP_CODEC rule 1 criterion 1 type message message methodType invite
set profiles signaling sipAdaptorProfile FP_CODEC rule 1 action 1 type variable
set profiles signaling sipAdaptorProfile FP_CODEC rule 1 action 1 operation store
set profiles signaling sipAdaptorProfile FP_CODEC rule 1 action 1 from type value value "0"
set profiles signaling sipAdaptorProfile FP_CODEC rule 1 action 1 to type variable variableValue var2 variableScopeValue message

# rule 2: store "AMR" to variable var2 if regex pattern "AMR/" matches in messageBody
set profiles signaling sipAdaptorProfile FP_CODEC rule 2 criterion 1 type message message messageTypes request
set profiles signaling sipAdaptorProfile FP_CODEC rule 2 criterion 1 type message message methodType invite
set profiles signaling sipAdaptorProfile FP_CODEC rule 2 criterion 2 type messageBody messageBody condition regex-match regexp string "AMR/" numMatch match
set profiles signaling sipAdaptorProfile FP_CODEC rule 2 action 1 type variable
set profiles signaling sipAdaptorProfile FP_CODEC rule 2 action 1 operation store
set profiles signaling sipAdaptorProfile FP_CODEC rule 2 action 1 from type value value "AMR"
set profiles signaling sipAdaptorProfile FP_CODEC rule 2 action 1 to type variable variableValue var2 variableScopeValue message

# rule 3: store "AMR-WB" to variable var2 if regex pattern "AMR-WB/" matches in messageBody
set profiles signaling sipAdaptorProfile FP_CODEC rule 3 criterion 1 type message message messageTypes request
set profiles signaling sipAdaptorProfile FP_CODEC rule 3 criterion 1 type message message methodType invite
set profiles signaling sipAdaptorProfile FP_CODEC rule 3 criterion 2 type messageBody messageBody condition regex-match regexp string "AMR-WB" numMatch match
set profiles signaling sipAdaptorProfile FP_CODEC rule 3 action 1 type variable
set profiles signaling sipAdaptorProfile FP_CODEC rule 3 action 1 operation store
set profiles signaling sipAdaptorProfile FP_CODEC rule 3 action 1 from type value value "AMR-WB"
set profiles signaling sipAdaptorProfile FP_CODEC rule 3 action 1 to type variable variableValue var2 variableScopeValue message

Flexible Policy rules can be associated either with the Ingress zone or the Ingress Trunk Group

To associate flexible policy rules with the ingress zone:

% set addressContext defaultAddressContext zone ZONE_IAD flexiblePolicyAdapterProfile FP_CODEC

To associate flexible policy rules with the ingress trunk group

% set addressContext defaultAddressContext zone ZONE_IAD sipsTrunkGroup IAD_TG signaling flexiblePolicyAdapterProfile FP_CODEC

Presence of codec "AMR" or "AMR-WB" is stored in var2, which is passed in the policy request to the PSX.

PSX Configuration

Create Call Parameter Filter Profiles

Figure 8: Create Call Parameter Filter Profile for AMR Codec

Figure 9: Create Call Parameter Filter Profile for AMR-WB Codec

Create Packet Service Profiles

Figure 10: Create Packet Service Profile for AMR-WB

Figure 11: Create Packet Service Profile for AMR

Create Packet Service Profile ID Groups

Figure 12: Create Packet Service Profile ID Group for AMR-WB

Figure 13: Create Packet Service Profile ID Group for AMR

Create Policy Profiles

Packet Service Profile ID Group and/or IP Signaling Profile can be associated to Policy Profile.

Figure 14: Create Policy Profiles for AMR-WB Codec

Figure 15: Create Policy Profiles AMR Codec

Create Policy Profile Group

Figure 16: Create Policy Profile Group

This policy profile group above will result in the following policy profile application:

SBX133_AMRWB will be applied if Flexible variable V2 is populated with the value "AMR-WB".
SBX133_AMR will be applied if Flexible variable V2 is populated with the value "AMR".

Apply Policy Profile Group to Trunk Group

For Egress policy apply Policy Profile Group to Egress Trunk Group.

Figure 17: Apply Policy Profile Group to Egress Trunk Group

For Ingress policy apply Policy Profile Group to ingress Trunk Group.

Figure 18: Apply Policy Profile Group to Ingress Trunk Group

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Route Based on "phone-context" Parameter Received in SIP Invite Message

Sample SIP INVITE

SBC Configuration

PSX Configuration

Create Flexible Variable Rules

Assign Flexible Variable Rules to Ingress Trunk Group

Configuring Flexible Routing by Using Call Processing Element Type and/or Call Parameter Filter Profile

Create Standard Routes Using Call Processing Element Types to Apply Flex Routing

Create Standard Routes using Call Parameter Filter Profile to Apply Flexible Routing

Apply Policy Based on the Presence of the AMR or AMR-WB Codec in a SIP Invite SDP

Sample SIP INVITE

SBC Configuration

Create Flexible Policy Rules and Apply to SBC

PSX Configuration

Create Call Parameter Filter Profiles