Is it possible to retain custom header values?

[Zalhera]

Hello,

We have a specific application which sends a customized SIP Header to our 3CX System.
Through Wireshark I can see that the custom header reaches 3CX correctly.
Is it possible that 3CX forwards this exact header to our VoIP Provider?
I tried many different values in the outbund parameter settings, but none of these retained the values of the original header.

Any help would be appreciated.

 

[YiannisH_3CX]

I am afraid this is not possible. The PBX will only use the headers available under the outbound parameters of the trunk. Any custom headers will be ignored.

 

[Zalhera]

Thank you for the reply.

Would it be possible for example to modify the P-Preferred-Identity header in an application and let 3CX forward the SIP package without altering this header value?

What we're essentially trying to do is to only modify the Preferred-Identity header from calls which are generated by this application and leave all other calls untouched.

 

[YiannisH_3CX]

I am not aware of a way to do that. 3CX will "fill" the SIP headers based on the value selected for that header. There is no custom header which will let you forward a custom value

 

[eddv123]

I think a true SBC (like an Audiocodes) would fit this requirement. They will give options for either termination and re-creation of the SIP session (SIP normalisation) or transparency of the call dialogue depending on the option you set.

 

[cobaltit]

Or just connecting directly to the SIP trunking provider, bypassing 3CX.