asterisk users - Jan 2018 - asterisk not transcoding on a re-invite codec change

I have an old setup based in Asterisk 1.8. The carrier is accepting Ulaw in
the initial invite, but immediately the call is established they send a
re-invite to change to Alaw. This doesn't get transcoded and the user gets
no audio from after the re-invite

 

Is/was this a problem for asterisk changing the codec and transcoding during
the call? The user is only offering ulaw.

 

Regards,

 

rik

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