How to use the G.723.1 codec in pass-thru mode in Asterisk

G.723.1 can only be used in pass-thru mode.

This means that there can be no access to Voicemail, etc

In order to ensure that it is used in this mode, pay attention to the configuration:
no T,t or monitor in the dialplan, application Dial

Configuration for the SIP channel

sip.conf needs the following:

[general]
disallow=all
allow=G723.1
allow=ulaw
allow=alaw

See also:

Asterisk | FAQ | Tips & Tricks

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