We are having an issue trying to set up Multicast Paging using the Page Pro module and are getting garbled audio to the phones.
- We are using the distro (10.13.66-17) FreePBX version 13.0.190.11 and Asterisk 13.12.1
- We have verified the issues and behavior is the same on our 2 different production systems and our test system
- We verified that the RTP streams from the server and the Phones where both using ulaw
- We are able to successfully page from phone to phone
- We have tested the Network infrastructure and verified that multicast and RTP are working through the LAN switching and routing normally.
- We captured and analyzed packets during paging and found that we have the issue when using Paging Pro and when using the manual config
exten => 8998,1,Page(MulticastRTP/basic/225.3.15.13:32000)
Pages would exhibit the issue and analysis showed multiple problems with the RTP stream including jitter and timing issues. (see images here http://imgur.com/a/0uf7v and http://imgur.com/a/jvPuJ )
when using the manual config
exten => 8997,1,Dial(MulticastRTP/basic/225.3.15.13:32000)
Everything worked and the streams looked good.(see here http://imgur.com/a/W3ReB and http://imgur.com/a/kcdA3 )
Anyone have any suggestions on where to go from here?