I have a simple scenario where I need to register my Asterisk box (15.3.0) to 3 SIP telecom providers. Each of the SIP providers gives me one trunk.
I am open to use either chan_sip or pjsip, depending on which of them could be albe to help me with my challenge - see below:
Each of my SIP providers requires me to set a specific constant string (some sort of a Base64 signature) in the User-Agent header of each SIP message that my Asterisk is sending out to them.
So basically: SIP provider 1 requires User-Agent: “xyz”, SIP provider 2 requires User-Agent: “abc” and SIP provider 3 requires User-Agent: “123” (I just used some dummy exmples).
I’ve read that the value of the User-Agent can be defined under the global section, whch seems to make this constant string the same for all trunks defined and does not help me at all…
What I need is to be able to specify in the definition of each trunk which static User-Agent header string should be used when “talking” to that SIP provider.
I’ve seen in https://wiki.asterisk.org/wiki/display/AST/PJSIP+Configuration+Wizard that some parameters can be passed unmodified to the native object and I was hoping that maybe the User-Agent could be passed as well when defining the trunk.
Does anyone know how to set a static User-Agent header per trunk?