Summary:ASTERISK-19598: Garbled audio using Page app and MulticastRTP channel
Reporter:Remi Quezada (remiq)Labels:
Date Opened:2012-03-28 11:58:17Date Closed:2017-12-14 10:12:16.000-0600
Status:Closed/CompleteComponents:Applications/app_page Channels/chan_multicast_rtp
Versions:SVN Frequency of
is related toASTERISK-16601 chan_multicast_rtp.so MulticastRTP no audio when using Page() App
Environment:Attachments:( 0) rtppage.cpt
( 1) rtp-page-capture.txt
Description:Getting garbled audio with Multicast RTP and Page application.  Multicast RTP works fine with Dial application.  

I am using the following phones for multicast rtp, all have the same garble audio:

Cisco spa504G
Cisco spa303
SNOM 821

SIP/256-eng is a Polycom Soundpoint 331

Able to reproduce with dialplan listed below. I also attached cli debug and an IP capture.  
Comments:By: Remi Quezada (remiq) 2012-03-28 13:08:33.435-0500

Asterisk is sending the RTP on and I have a Adtran 908 router configured to change to  All the Cisco and SNOM phones are configured to receive the multicast RTP on  

By: Vitaliy Aleksandrov (vitalik) 2012-11-07 04:04:29.478-0600

The problem is still present. I have tested MulticastRTP channel with Dial command and it works really great. But when i'm trying to use it with app_page (that uses confbridge) i'm getting a very garbled audio.
Confbridge with SIP channels works great too.

Is there any way to send multicast stream to more that one interface without app_page ?

p.s. all tests were made at asterisk-11

By: Sean Bright (seanbright) 2017-12-14 10:12:17.103-0600

If you can reproduce this with Asterisk 13.18+, please feel free to re-open.