[Asterisk-Users] More jitter buffer questions

[Moody]

I've been trying to resolve some quality issues and I was hoping
someone might be able to provide some insight.

To give you an idea the calls are coming in via a SIP DID and sent out
via an IAX2 connection. Latency to both the SIP equipment and IAX
equipment are around 80ms with 0 packet loss accoridng to ping tests.
The server is located in a data centre so bandwidth is not an issue.

Most problems seem to sound like silence detection to me but I have
confirmed it doesn't exist from the DID provider (SIP) and Asterisk
doesn't use it so I can't see where it is coming into play. I have
tried with and without the jitter buffer and seem to get a little
better quality with it but both suffer silence problems and missing
audio. I have included the results from a 'iax2 show channels' command
while a test call is in progress and you cna see the latency and
jitter buffer at work (watch the word wrap in some browers)

Any insight or further tests would be appreciated.

Regards, 

Jonathon

----

Channel               Peer             Username    ID (Lo/Rem)  Seq
(Tx/Rx)  Lag      Jitter  JitBuf  Format
IAX2/voipjet/1        216.118.117.xx   xx          00001/00147 
00021/00019  00066ms  0025ms  0037ms  ulaw
1 active IAX channel(s)
a1011*CLI> iax2 show channels
Channel               Peer             Username    ID (Lo/Rem)  Seq
(Tx/Rx)  Lag      Jitter  JitBuf  Format
IAX2/voipjet/1        216.118.117.xx   xx          00001/00147 
00021/00019  00066ms  0025ms  0037ms  ulaw
1 active IAX channel(s)
a1011*CLI> iax2 show channels
Channel               Peer             Username    ID (Lo/Rem)  Seq
(Tx/Rx)  Lag      Jitter  JitBuf  Format
IAX2/voipjet/1        216.118.117.xx   xx          00001/00147 
00022/00019  00066ms  0025ms  0037ms  ulaw
1 active IAX channel(s)
a1011*CLI> iax2 show channels
Channel               Peer             Username    ID (Lo/Rem)  Seq
(Tx/Rx)  Lag      Jitter  JitBuf  Format
IAX2/voipjet/1        216.118.117.xx   xx          00001/00147 
00026/00023  00066ms  0007ms  0018ms  ulaw
1 active IAX channel(s)
a1011*CLI> iax2 show channels
Channel               Peer             Username    ID (Lo/Rem)  Seq
(Tx/Rx)  Lag      Jitter  JitBuf  Format
IAX2/voipjet/1        216.118.117.xx   xx          00001/00147 
00026/00023  00066ms  0025ms  0037ms  ulaw
a1011*CLI> iax2 show channels
Channel               Peer             Username    ID (Lo/Rem)  Seq
(Tx/Rx)  Lag      Jitter  JitBuf  Format
IAX2/voipjet/1        216.118.117.xx   xx          00001/00147 
00034/00030  00077ms  0025ms  0036ms  ulaw
1 active IAX channel(s)
a1011*CLI> iax2 show channels
Channel               Peer             Username    ID (Lo/Rem)  Seq
(Tx/Rx)  Lag      Jitter  JitBuf  Format
IAX2/voipjet/1        216.118.117.xx   xx          00001/00147 
00034/00030  00077ms  0025ms  0036ms  ulaw
1 active IAX channel(s)
a1011*CLI> iax2 show channels
Channel               Peer             Username    ID (Lo/Rem)  Seq
(Tx/Rx)  Lag      Jitter  JitBuf  Format
IAX2/voipjet/1        216.118.117.xx   xx          00001/00147 
00034/00030  00077ms  0007ms  0036ms  ulaw
1 active IAX channel(s)
a1011*CLI> iax2 show channels
Channel               Peer             Username    ID (Lo/Rem)  Seq
(Tx/Rx)  Lag      Jitter  JitBuf  Format
IAX2/voipjet/1        216.118.117.xx   xx          00001/00147 
00034/00030  00077ms  0007ms  0036ms  ulaw
1 active IAX channel(s)