Signaling Manipulation - Avaya Aura Communication Manager 7.1 Application Notes

7.3.3 Signaling Manipulation

Signaling Manipulations are SigMa scripts the Avaya SBCE can use to manipulate SIP
headers/messages. In the reference configuration, one signaling manipulation script is used.
Note – Use of the Signaling Manipulation scripts require higher processing requirements on the
Avaya SBCE. Therefore, this method of header manipulation should only be used in cases where
the use of Signaling Rules or Interworking Profiles does not meet the desired result. Refer to [10]
for information on the Avaya SBCE scripting language.
Step 1 - Select Global Profiles  Signaling Manipulation from the left-hand menu (not shown).
Step 2 - Select Add.
Step 3 - Enter a name for the script in the Title box (e.g., remove Contact parameter). The
following script is defined:
within session "ALL"
{
act on message where %DIRECTION="OUTBOUND" and %ENTRY_POINT="POST_ROUTING"
{
//Remove gsid and epv parameter from Contact header to hide internal topology
remove(%HEADERS["Contact"][1].URI.PARAMS["gsid"]);
remove(%HEADERS["Contact"][1].URI.PARAMS["epv"]);
}
}
Step 4 - Click on Save. The script editor will test for any errors, and the window will close. This
script is applied to the Verizon Server Configuration in Section 7.3.5, Step 3.
Note – These parameters contain unnecessary information for Verizon, including the internal
domain. Removing these parameters helps to mask the internal topology of the enterprise and
reduces the size of the SIP packet sent to Verizon. The Endpoint-View header and other
proprietary headers are removed using an adaptation as illustrated in Section 5.3.
DDT; Reviewed:
SPOC 10/18/2017
Solution & Interoperability Test Lab Application Notes
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