Gradwell Dropped Audio

[voipisthenextbigthing]

Has anyone else suffered dropped audio with Gradwell ? Several of my clients have mentioned this with the audio just going completely and them taking to themselves until they realise.

Apparently they did some work recently to stop this by replacing T1 line cards but I still get it reported.

Just interested in others experience.

[gareth]

Yeah, I have similar problems. I'm trying to figure out whether it's our connection at fault or Gradwell themselves... if other people are having the same issue that would seem to suggest the latter.
Other problems include occasional total disconnects of everyone in the office, and also once we went for several hours only being able to make outgoing calls but not receive any incoming.

[voipisthenextbigthing]

I did a temp change and put one client via voip.co.uk. And can produce similar call drops, around one in every 40ish. Clearly this starts to indicate the problem might not be Gradwell related but due to the increased number of drops and no change in the config for the Gradwell trunks something doesn't add up. It is also my understanding that voip.co.uk and Gradwell both use Gamma Telecom for termination.

I am aware Gradwell had some issues and had what i was told T1 line cards replaced a little while ago.

When calls drop the Asterisk PBX reports 'maximum retires exceeded to critical request'. Sounds like some packets are not received / replied to.

Although the NAT and port forwarding looks correct and has worked in the past I am trying removing NAT from the config and putting the Asterisk PBX on a pubilc IP.

Will let you know how I get on.

[voipisthenextbigthing]

Gareth,

I've made some progress with my problem. To help you:
Are you using Asterisk?
If Asterisk do you know what version?
Is you dropped call problem on incoming calls?
Is is within a short duration of the call been setup?

[gareth]

We're running Asterisk 1.2.13 from a debian package.

We definitely have more problems on outgoing calls than incoming ones, but both are bad. Sometimes it's dropped connections, sometimes it's garbled sound (our internet connection is theoretically a very good one so bandwidth shouldn't be an issue), and very occasionally the one-way sound thing happens. The first two are the most common though.

thanks for helping me out with this :)

Gareth