I’d just like some comments on our current setup and if possible some pointers on the quality problems we are having.
We have the following setup:
Two phone servers linked via Dundi using freepbx 184.108.40.206 and asterisk 220.127.116.11.
One in the UK on a leased line: (20MB up/20MB down)
The server in the UK uses Gradwell for outbound calls in the UK and SIPTraffic (gold) for everywhere else. We also use gradwell and voip.ms for inbound calls on this pbx. The server is a quad core with plenty of ram and is never under any load. On this server (locally) we have around 10 phones connected to it via SIP (a mix of Aastra 6757i and Cisco 7940) and a few remote users. There are issues with calls cutting out for around a second (sometimes less) and cutting back in again. Does anyone know where I should start debugging this problem?
The home users also experience quality issues outbound (they can hear people fine but their voice is choppy), could this issue be related to the codec in use?
The other phone server is in California (same spec) on a comcast business cable connection (internet connection: 20MB down/10MB up) with around the same amount of users (and around 6 remote users) and experiences the same problem with calls cutting out every so often. Remote users have an even bigger problem (the cutting out is more frequent). We use Vitelity and SIPTraffic in the US and voip.ms for inbound calls.
It doesn’t seem to matter which provider is in use, these problems seem to happen with all of them.
After searching around It appears that this may be a timing or codec issue, does anyone have any comments or a similar setup?