I'm not an expert here and sorry for the silly question.
My customer would like to understand if via SIP LUA or other ways it could be possible to "mantain" the "Via" header field when routing a call across CUCM.
this the scenario
Phone -- > Expressway --- > CUCM1 -- > SIP trunk -- > CUCM2-- > phone
When the call comes in from Expressway to CUCM1 there is a specific "via" header field like this
"Via: SIP/2.0/TLS 126.96.36.199:54200; branch=z9hG4bk00000012; received=188.8.131.52;rport=52696;..........snip"
when the call is routed through CUCM the same header is changed as:
"Via: SIP/2.0/TLS 10.1.1.1:5060; branch=z9hG4bk0234566712....snip"
Question is: is there a script could help to mantain the same Via header field ?