I can't help on the first issue, but for the second have you tried doing
Set(${SIP_CODEC}=ulaw) before dialing the trunk? I'm in a similar situation
where we have g722 internally but our trunk provider only offers ulaw so I
see g722->slin->ulaw transcoding. I'm thinking of trying it here (on
1.8.14.1) to troubleshoot our occasional outbound issues.
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