[asterisk-bugs] [JIRA] (ASTERISK-28436) Transcoding happening even though it is not necessary

[Flole Systems (JIRA)]

Flole Systems created ASTERISK-28436:
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             Summary: Transcoding happening even though it is not necessary
                 Key: ASTERISK-28436
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28436
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: pjproject/pjsip
    Affects Versions: 15.3.0
            Reporter: Flole Systems


A phone has G722,ulaw,alaw set as allowed codecs. The SIP Provider only allows G722 when the number dialed does support it. For the provider I set allow to G722,ulaw,alaw aswell.

When setting up a call asterisk first negotiates a codec with the phone (G722) and then with the provider (ulaw in the worst case). Instead of switching the phone to ulaw aswell (it does support that), asterisk starts to transcode using 5 times the CPU power a normal call would take. This is not only a waste of resources but also reduces audio quality while having absolutely no benefit.

I would expect asterisk to start re-negotiating the codec once it knows which codec each party supports selecting the most prefered one (aka the first one in my allow list) that both parties support. Only if there is none, use transcoding. If transcoding is not possible, fail.



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