Send ringback tones on Asterisk

By default asterisk only sends ‘180 Ringing’ when RING event is requested.

To send a ringback tone using early media two settings must be changed.

  • sip.conf

prematuremedia=no ;this does the exact opposite of what everybody thinks it does...
progressinband=yes

Test with Dial option ‘r’ and see if you get 183 Session Progress.

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