snom 370 with iax
Submitted by fitzrik on Sun, 05/18/2008 - 11:06am.
I'm still experiencing problems wih call quality.
I've read a little that suggests iax might be better than sip so I'd like to try it out.
In freepbx I can set up an extension to use iax2 instead of sip. Can I tell a snom phone to connectvot this iax2 extension? If so, how?
Thanks
R
Snom phones
Sun, 05/18/2008 - 11:48am
Snom phones all use the SIP protocol. So in freepbx, for Snom, you need to select "create a sip extension" IAX2 is a different Voip protocol. Atcom make IAX2 hardphones like the AT530 and the AT320 and there are a number of IAX2 softphones such as Dante. You can't configure SIP phones to use IAX2 or viceversa.
If you are having call quality issues its most unlikely to be due to the SIP protocol. I have used snom 190, 200, 220, 300 and not had problems with call quality from the handsets.
Snom phones
Sun, 05/18/2008 - 12:17pm
I have just looked at your other posts to see what sort of setup you have. I don't have time at the moment to go through all of them so I may be off beam, but I see you mention VPN and 1000miles. So here goes...
Last year I ran a remote extension from where I was staying in Colorado and then Virginia back to my server in the UK using the dante/diax softphone on my laptop with a USB phone as an audio device. You can d/l diax from here http://www.laser.com/dante/diax/diax.html The quality was excellent, I had no problems at all over the two week period of my trip. I would recommend that you try a softphone on a pc with head phones or a usb phone to see how that compares with your experience of your 370's.
I did not use a vpn I just portforwarded the appropriate ports (4569 UDP for IAX2) through the f/w to the server. With remote phones you must have QoS on your f/w / router otherwise other internet traffic from your localnet will chop up the call. You may have that in place already.
I have also setup SNOM 300 as a remote extension for a client over a distance of 20 miles or so. I don't think that was over a VPN. I have also run Cisco 7940/7960 as remote SIP phones without problems just using portforwarding on the f/w (smoothwall). All these seemed to work without call quality issues.
hth
I only have one remote
Sun, 05/18/2008 - 12:35pm
I only have one remote extension. We have ten local extensions and we are experiencing call quality issues on each of those.
I have been focusing on the zap/pstn channels up to now assuming the problem was there, but now I think it might be a local problem instead. Its really really irritating.
We don't make many internal calls. Its a call centre so we mostly receive calls and there is variable call quality. Some calls are ok and some aren't. Probably most experience some issues.
Network issues
Sun, 05/18/2008 - 5:11pm
You mentioned you changes the speed of the network card, why and how?
You need to start at Layer 1 first test all of your cables, do you have acess to a cable tester like a Fluke or a Penta Scanner?
If you don't start looking for errors on the Ethernet interfaces? Are the switches managed?
Even if you think it is OK check everything from top to bottom in order. Make 1 change at a time.
Scott
--
Scott
aka "Skyking"
Member Since:
2007-11-08