Sip normalization is a method used to modify sip messages sent from the call manager out the sip trunk. Before call manager 8.5 if we had to modify the sip messages the same had to be done by using a CUBE and appliying sip profiles on dial peers.
It is normally required in a scenario when you are integrated with a third party sip server and they have specific requirements in terms of information coming from the cisco side.
Cisco call manager (8.5 and above) ---> sip trunk -----> third party sip server
Sip normalization is a C script which enables us to change the various headers fields of a SIP messgae such as invite , from to, 181 etc.
We create a recusrive function call, and enter the queries in a if else format.
Following are the steps to apply a normalization scrip on calls:
On the call manager admin page go to device
Navigate to device settings and select sip mormalization script under it.
Click on add new. Name the scipt something according to your naming conventions.
Below is a example of a default script where in we need to change the from feild in the SIP invite message and add "user=phone" tag.
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