On 9/20/19 12:49 AM, Rohit Jain wrote:
Hi All,
I have a query that can a SIP device fallback from fax to audio again.
Following is the scenario:
User initiated a call with audio and call is connected.
After this user sent a ReInvite with t38 fax and both offer answer are
negotiated.
Can a user again send ReInvite with audio, or after fax call should be
disconnected.
In Normal scenario to send Fax, first audio is required to be established
in SIP. Once fax is done can endpoint again fallback to audio ? Is it a
practical usecase ?
This isn't really a sip question. From a sip signaling perspective it is
totally fine to change media over and over again within a call. So if
you want to revert from t38 back to normal audio then go ahead and make
an offer to do so.
It question is whether the other end is prepared to handle the change.
That will depend upon its construction. If not, then presumably it will
refuse the offer to change and/or terminate the call. If your request to
change back fails, but the call remains up, then you can make a new
decision about what you want to do.
Thanks,
Paul
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