IAX2 remote extension has bad audio

General Help
1

Hi,

I have a remote extension and the audio is a little crackly and occasionally has dead spots for a second or so at a time, I was originally using a sip but it was failing to register some times but now I have an IAX2 extension it has no issue with registering but the audio is a little bad.

There is only one remote user at the moment.

The bandwidth shouldn’t be an an issue (down: 18298 Kbps up: 1537 Kbps) and the remote user is on a fiber connection0 using Zoiper.

Any ideas that would be grate.

2

That’s always a network issue, bandwidth is not the limiting factor, it is all about latency, either sip or iax2, many carriers delay (or perhaps I should say FW :wink: ) voip connections on SIP and IAX2.

3

Thanks, I had a server die on me due to an update, and I had no audio issue there, but since I have done a new install the audio has never been the same

4

Sorry can’t help you there, way too little info or diagnostics given.

5

Sorry, can you point me in the right direction to gaether the information?

I did this test

nmap -p 4569 xxx.xx.170

Starting Nmap 5.51 ( http://nmap.org ) at 2014-12-05 16:36 AEDT
Nmap scan report for xxx.xx.170
Host is up (0.19s latency).
PORT STATE SERVICE
4569/tcp filtered unknown

Nmap done: 1 IP address (1 host up) scanned in 2.79 seconds

Thanks

6

I have no experience with connections in the Philippines but IAX2 runs on UDP not TCP so

nmap -sU -p 4569 xxx.xx.170

and the best you can get is from the Asterisk CLI:

iax2 set debug on

from bash

tcpdump -vv -n udp port 4569

would give you more information, look carefully at the timestamps and interleaving of packets