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Transparently mantain "Via" header field across CUCM

Question asked by mmenozzi on Dec 1, 2015
Latest reply on Dec 8, 2015 by mstover

Hi team.


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; branch=z9hG4bk00000012; received=;rport=52696;..........snip"


when the call is routed through CUCM the same header is changed as:


"Via: SIP/2.0/TLS; branch=z9hG4bk0234566712....snip"


Question is: is there a script could help to mantain the same Via header field  ?