I am new to all of this and before embarking on a full IP set up, I am trying to experiment a bit with FreePBX and softphones.
I had everything working pretty well pretty quickly, but when making internal test calls we readlised that there was a really disturbing lag in the calls (delay betwee person A saying something and person B hearing it).
This is making conversations really difficult : pauses in the conversation, difficult to barge in (I am sure you knos what I mean).
This was confirmed with echo tests (*43) where the delay seems to be around 250 to 500 ms (wild guess, but this is sounding like ages)…
I have tried to record the echo test call, but it would not let me (I was able to record calls, so I know recording works).
My first question is : how can I measure this lag in order to help you telling me how bad/normal it is ? Recording the echo test would have been perfect has, making a “plop” I would see 2 spikes and would be able to measure time in between.
My second question is : how can I fix it and what can I expect with the real system (yes, ultimately, this is what maters) ?
My setup :
FreePBX… not sure but it is the last one.
Server is virtualized on Debian Squeeze
network with 15 desktops
ping to server is <1ms with the odd bump between 50 and 100.
used X-Lite as softphone.
I am really worried that it will not be better with real phones (leaning towards Yealink) and some users will be on softphone anyway.
The hard phones will have their own network and switch, but the server will still be in the data lan and the users on softphones will be on the network they are today…
sip show peers
Name/username Host Dyn Forcerport ACL Port Status
2010/2010 192.168.144.77 D A 17392 OK (15 ms)
2011/2011 192.168.144.55 D A 53835 OK (31 ms)
2020/2020 (Unspecified) D A 0 UNKNOWN
2021/2021 192.168.144.65 D A 43776 OK (3 ms)
2030 (Unspecified) D A 0 UNKNOWN
4010 (Unspecified) D A 0 UNKNOWN
4011/4011 (Unspecified) D A 0 UNKNOWN
4020/4020 (Unspecified) D A 0 UNKNOWN
4030 (Unspecified) D A 0 UNKNOWN
OVHtemp/0033972282097 18.104.22.168 N 5060 OK (104 ms)
10 sip peers [Monitored: 4 online, 6 offline Unmonitored: 0 online, 0 offline]
I am using ext 2010 (PC) and 2011 Android SIP Phone, the other “tester” is on 2021 (Android SIP phone).
OVHtemp is my provider’s trunk (no dedicated link yet).
I would understand some lag on external calls, but it really seems worse internally.