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Table of Contents
About this Page
  • A sneak peek into the SBC 1000/2000's new SIP Header Manipulation Feature. This new feature permits any SIP header to be added, deleted, or modified.
  • This SIP Header Manipulation example uses the Literal manipulation option and shows how perform Header Manipulation only when certain criteria are met.
  • This document uses the Conditional Rules feature to limit Message Manipulation to very specific instances.
Related Articles

Prerequisites

Requires

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SBC2000/1000 Version 2.2

Summary

Because you can never tell just what the other side might send or need, the SBC1000/2000 version 2.2 will include a feature to manipulate any SIP header.

  • SIP Headers can be added, deleted, or modified.
  • Manipulation can be done for every SIP message, or separately for SIP Requests or SIP Responses.
  • Manipulations can set to occur based upon user specified matching criteria.
  • Manipulations can be executed at the ingress or egress SG. At the ingress, inbound SIP messages are modified to permit proper handling by the SBC's routing function. At the egress, SIP messages already processed by the SBC are modified to meet the SIP requirements of the upstream device.

PAI Static Modification

In today's sneak peek, we modifiy the PAI at the egress SG for a PSTN > SBC > Lync call. This is an example of a static replacement--a replacement that will take place on every SIP packet that leaves the SBC bound for Lync.

Near the end of the document, we'll add a configuration that will make the PAI modification conditional, only changing the PAI when certain criteria is met.

Configure the SBC1000/2000

  1. Select the new Message Manipulation entry in the navigation tree

    Select Message Manipulation

     

  2. Add a SIP Message Rule Table

    Add SIP Message Rule Table

  3. Set how the rule will be applied. It can be applied to All SIP Messages, only Requests, only Responses, or Selected Messages.

    Applicable Messages

     

  4. Add an entry to the new table.

    Add Entry

  5. Set the Header Action to Modify and the Header Name to P-Asserted-Identity. As you can see, any SIP Header can be manipulated.

    Set Header Action and Name

  6. To set the new PAI value, click Add/Edit...

    Set PAI Value

  7. ... and add the new value in the Edit Message Field

    Edit Message Field

  8. Click OK to complete adding the entry to the table.

    Click OK

     

  9. In the SG, Enable the Message Manipulation

    Enable Message Manipulation

  10. Add the new Message Manipulation to the Outbound Message Manipulation Table

    Add Message Table

Debugging Output

In the debugging output below, you can see the PAI change from +15103644064 to 555

                                                                           [2012-10-03 18:20:32,198] 5392 0001 com.net.ux.sip DEBUG (Transaction.cpp:685) - egressProtocolRepair: Transaction Protocol Repair (Transaction),calling Egress executive(1 item(s) on list)
[2012-10-03 18:20:32,198] 5393 0001 com.net.ux.sip DEBUG (Executive.cpp:52) - Run: Protocol Engine::Executive running 1 rules
[2012-10-03 18:20:32,198] 5394 0001 com.net.ux.sip TRACE (Executive.cpp:58) - Run: Protocol Engine::getting ruleid (1)
[2012-10-03 18:20:32,198] 5395 0001 com.net.ux.sip TRACE (Executive.cpp:75) - Run: Processing Message Rule (PAI fix)
[2012-10-03 18:20:32,198] 5396 0001 com.net.ux.sip TRACE (Executive.cpp:127) - processMessageRule: Processing Message Rule (1)
[2012-10-03 18:20:32,198] 5397 0001 com.net.ux.sip TRACE (Executive.cpp:1252) - MatchSipMessageRule: StartLine from configuration (*)From Msg (INVITE sip:+14083483531@sba1.vx.net:5067;user=phone SIP/2.0
)
[2012-10-03 18:20:32,198] 5398 0001 com.net.ux.sip DEBUG (HeaderRule.h:231) - debugInfo: HeaderRuleModify
[2012-10-03 18:20:32,198] 5399 0001 com.net.ux.sip DEBUG (HeaderRule.h:176) - debugInfo: HeaderRulePayload:: FieldList
[2012-10-03 18:20:32,198] 5400 0001 com.net.ux.sip DEBUG (ProtocolField.h:93) - debugInfo: FieldElement:: FieldType(1) Source(<sip:555@10.1.1.74:5067;user=phone>)
[2012-10-03 18:20:32,199] 5401 0001 com.net.ux.sip DEBUG (ProtocolField.h:211) - debugInfo: FieldElementLiteral:: stringLiteral(<sip:555@10.1.1.74:5067;user=phone>)
[2012-10-03 18:20:32,199] 5402 0001 com.net.ux.sip DEBUG (HeaderRule.h:115) - debugInfo: HeaderRule:: HeaderRuleType(1)
[2012-10-03 18:20:32,199] 5403 0001 com.net.ux.sip DEBUG (RuleBase.h:123) - debugInfo: RuleBase:: RuleBaseType(1)  Result(0) Description(test pai) valid(true), Condition Expression(${1})
[2012-10-03 18:20:32,199] 5404 0001 com.net.ux.sip TRACE (Executive.cpp:211) - processMessageRule: Processing Header rule
[2012-10-03 18:20:32,199] 5405 0001 com.net.ux.sip DEBUG (Executive.cpp:316) - processHeaderRule: Processing header Rule (test pai)
[2012-10-03 18:20:32,199] 5406 0001 com.net.ux.sip TRACE (Executive.cpp:328) - processHeaderRule: Processing header Conditions Count=1
[2012-10-03 18:20:32,199] 5407 0001 com.net.ux.sip TRACE (Executive.cpp:640) - processConditionRules: Condition Rule value=1
[2012-10-03 18:20:32,199] 5408 0001 com.net.ux.sip TRACE (Executive.cpp:652) - evaluateConditionRuleTruth: CREId=1
[2012-10-03 18:20:32,199] 5409 0001 com.net.ux.sip DEBUG (ConditionRule.h:121) - debugInfo: ConditionRule:: Description: test rule AdminState(0) Result(0) Operand(1) valid(true)
[2012-10-03 18:20:32,199] 5410 0001 com.net.ux.sip DEBUG (ProtocolField.h:93) - debugInfo: FieldElement:: FieldType(0) Source(header["from",1].uri[1].userinfo.user)
[2012-10-03 18:20:32,200] 5411 0001 com.net.ux.sip DEBUG (ProtocolField.h:272) - debugInfo: FieldElementObject:: Valid Object Tokens
[2012-10-03 18:20:32,200] 5412 0001 com.net.ux.sip DEBUG (ProtocolField.h:93) - debugInfo: FieldElement:: FieldType(1) Source(+15103644064)
[2012-10-03 18:20:32,200] 5413 0001 com.net.ux.sip DEBUG (ProtocolField.h:211) - debugInfo: FieldElementLiteral:: stringLiteral(+15103644064)
[2012-10-03 18:20:32,200] 5414 0001 com.net.ux.sip TRACE (Executive.cpp:727) - buildField: Building fields with element count=1
[2012-10-03 18:20:32,200] 5415 0001 com.net.ux.sip TRACE (Executive.cpp:755) - buildField: Building field literal
[2012-10-03 18:20:32,200] 5416 0001 com.net.ux.sip TRACE (SipMessage.cpp:1311) - getObjectValue: name:(3:Header) value:
[2012-10-03 18:20:32,200] 5417 0001 com.net.ux.sip TRACE (Executive.cpp:706) - evaluateConditionRuleTruth: Full CR match=1. oObj=+15103644064, oMatch=+15103644064, oObjLen=12, oMatchLen=12
[2012-10-03 18:20:32,200] 5418 0001 com.net.ux.sip TRACE (Executive.cpp:336) - processHeaderRule: Condition matched
[2012-10-03 18:20:32,200] 5419 0001 com.net.ux.sip TRACE (Executive.cpp:374) - processHeaderRule: Processing Rule Modify
[2012-10-03 18:20:32,200] 5420 0001 com.net.ux.sip TRACE (Executive.cpp:727) - buildField: Building fields with element count=1
[2012-10-03 18:20:32,200] 5421 0001 com.net.ux.sip TRACE (Executive.cpp:755) - buildField: Building field literal
[2012-10-03 18:20:32,201] 5422 0001 com.net.ux.sip TRACE (Executive.cpp:963) - headerModify: Executing header modify
[2012-10-03 18:20:32,201] 5423 0001 com.net.ux.sip TRACE (Executive.cpp:1297) - checkOrdinalAll: ObjectToken:: StringIndex(p-asserted-identity) Ordinal(1)
[2012-10-03 18:20:32,201] 5424 0001 com.net.ux.sip TRACE (Executive.cpp:967) - headerModify: Header modify single ordinal
[2012-10-03 18:20:32,201] 5425 0001 com.net.ux.sip TRACE (SipMessage.cpp:1311) - getObjectValue: name:(3:Header) value:
[2012-10-03 18:20:32,201] 5426 0001 com.net.ux.sip TRACE (SipMessage.cpp:1391) - setObjectValue: name:(3:Header) value:<sip:555@10.1.1.74:5067;user=phone>
[2012-10-03 18:20:32,201] 5427 0001 com.net.ux.sip TRACE (Executive.cpp:218) - processMessageRule: HeaderRule executed
[2012-10-03 18:20:32,201] 5428 0001 com.net.ux.sip TRACE (Executive.cpp:81) - Run: Message Rule (1) matched at least one message rule
[2012-10-03 18:20:32,201] 5429 0001 com.net.ux.sip DEBUG (Transaction.cpp:687) - egressProtocolRepair: Transaction Protocol Repair, out of Egress executive
[2012-10-03 18:20:32,202] 5430 0001 com.net.ux.sip DEBUG (TransportLayer.cpp:1316) - startTransaction: Sending data if=0.
[2012-10-03 18:20:32,203] 5431 0001 com.net.ux.sip.libctl TRACE (TransportTlsSocket.cpp:2278) - TX application data size: 990 for conn_id: 427 on handle: 0x2200b8, retry: 0, retry attempts: 0
[2012-10-03 18:20:32,204] 5432 0001 com.net.ux.sip DEBUG (TransportLayer.cpp:538) - 0x293a30 sending from [10.1.1.74]:25174 to [10.1.1.73]:5067 990 bytes over 00TLS722-25174 attempt(1) (If:0) ln(1320):
[2012-10-03 18:20:32,204] 5433 0001

INVITE sip:+14083483531@sba1.vx.net:5067;user=phone SIP/2.0
Allow: INVITE, ACK, CANCEL, BYE, UPDATE, NOTIFY, OPTIONS, REFER, REGISTER
Call-ID: call-4CE51900-0000-0010-0C13-B
Contact: <sip:+15103644064@ux.vx.net:5067;transport=TLS>
Content-Length: 353
Content-Type: application/sdp
CSeq: 1 INVITE
From:  <sip:+15103644064@10.1.1.74:5067;user=phone>;tag=a01014a-85
Max-Forwards: 70
P-Asserted-Identity:  <sip:555@10.1.1.74:5067;user=phone>
Supported: replaces,update,100rel
To:  <sip:+14083483531@sba1.vx.net:5067;user=phone>
User-Agent: NET UX 2.2.0v177 UX
Via: SIP/2.0/TLS 10.1.1.74:5067;branch=z9hG4bK-UX-0a01-014a-02fa

v=0
o=UX 1007 1007 IN IP4 10.1.1.74
s=VoipCall
c=IN IP4 10.1.1.74
t=0 0
m=audio 16432 RTP/SAVP 8 0 101 13
c=IN IP4 10.1.1.74
a=rtpmap:8 PCMA/8000/1
a=rtpmap:0 PCMU/8000/1
a=rtpmap:101 telephone-event/8000
a=rtpmap:13 CN/8000
a=ptime:20
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:oovkXPxgygyKXpZrX9W4gx9s6z1KQnRnIrk/mNcT|2^31|1:1
a=[2012-10-03 18:20:32,204] 5434 0001
sendrecv

Conditional PAI Modification

By adding a Conditional Rule to the Message Rule, you can perform the manipulation only when it matches a particular condition. In the example below, the PAI would only be modified if the call is from +15103644064.

  1. Add a Conditional Rule Table entry

    Add Conditional Rule Table Entry

     

  2. Add the Description and set the Match Type from the pulldown. In this case, we're looking to match the calling number, which is represented by the from.uri.userinfo.user token.

    Add Description and Match Type

  3. Set the Operation to Equals. Set the Match Value Type to Literal and put the number to be matched into the Match Value.

    Set Operation

  4. With the Match information configured, it's time to modify the Message Rule so that it only runs when the Condition is met. In the Message Rule, click the Condition Expression Add/Edit button.

    Set Static PAI

  5. Set it for Match All Conditions and select the Conditional Rule you just finished programming in the previous steps. Click Apply.

    Message Rule Condition

  6. Click Apply to complete the update to the Message Rule.

    Update Message Rule

Important Notes

The SIP Header feature cannot generate a new SIP packet. Only arriving or leaving SIP packets changed via the SIP Header function.

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