Create custum SIP header to userphone

[SergeB]

Hello,

 

I have a VOIP to analog audio box to make public announcements. But to change the pre sound tone I have to create a custum SIP header string.

The box is connected by a sip account to the Swyxware server.

The manual of de SIP audio box (SNOM PA1) says this:

·        You then need to use the Alert-Info SIP header from the PBX to allow the PA1 to automatically answer the call with the required delay, it needs to send something like this:
        Alert-Info: <http://www.notused.com>;info=alert-autoanswer;delay=2"

·        This way the PA1 will auto answer only if there is an Alert-Info SIP header: in this case the header value sets the delay in the auto answer at 2 seconds so the phone rings for 2 seconds, playing the tone you are using as a custom ringtone, and then answers the call.

 

Is this possible? And how?

Thank you.