15 Oct
2024
15 Oct
'24
2:17 p.m.
Hi Daniel
this is a common scenario and the UAC (the phone)
should be able to cope
with it.
By parallel forking, there will be two different To-tags, so practically
during the call setup, the UAC has to maintain two different
(early-state) dialogs, when one is answered with 200ok, the other one is
cancelled.
If the UAC that you use doesn't support parallel forking by downstream
proxies, then either you replace it with a capable one; configure it
with a single codec; as you suggested, strip codecs on proxy leaving a
single option; or route first via a transcoding system.
The UAC in question, is the Swisscom Mobile Network.
I guess it's not feasible to tell Swisscom to replace all the millions
of mobile phones in operation. :-)
They tell me it's in the RFC, you side is not RFC compliant.
Mit freundlichen Grüssen
-Benoît Panizzon-
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