I am using AMI for originating outbound calls through SIP trunk. So AMI originates call through softphone to the outbound number.
When outbound number is temporary unavailable (like GSM number), there is no sound.
If I call the same number directly through softphone, I can hear “the number you are calling is temporary unavailable,…”
I compared SIP debugging for both direct softphone call and AMI call, and there seems to be no difference at all. Same codecs are used (ulaw, alaw, gsm).
Whenever there is some sort of answering machine on the other side, there is no sound in softphone,(using AMI originate).
Any idea what might be a problem?
[Ubuntu Server 18.04]
[Xlite softphone ver. 3]