Duplicated Value for Branch Parameter of Via Header Field when SCA Running with Prack-support=true (Doc ID 2214644.1)

Last updated on DECEMBER 21, 2016

Applies to:

Oracle Communications Network Charging and Control - Version 4.4.1 to 6.0.0 [Release 4.4 to 6.0]
Information in this document applies to any platform.

Symptoms

On Oracle Communications - Network Charging and Control (OC-NCC) 4.4.1, all the requests being sent by SIP Control Agent(SCA) running with prack_support=true have the same value for "branch" parameter of "Via" header field.

According to RFC 3261-SIP:Session Initiation Protocol, section "8.1.1.7 - Via", branch parameter value MUST be unique:

"The branch parameter value MUST be unique across space and time for all requests sent by the UA.  
 The exceptions to this rule are CANCEL and ACK for non-2xx responses."


As an example, here are two frames of traffic capture for a call on which this problem occurred:



Changes

 Running SCA with prack-support=true.

Cause

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