Voxalot / SIP Broker Support Forums - View Single Post

boatman · 07-22-2008, 05:45 AM

I am not sure how to interpret the "Noisy feedback" line, but it seems that your phone may be configured to use tcp transport, normally SIP uses udp transport. The NAT settings on your phone may be wrong, and it may be inserting it's LAN IP address where the public IP address should appear.

You can check the NAT settings by calling this SIP number: *0@proxy01.sipphone.com. If it says "you are behind a SIP compatible router" then your NAT settings are probably okay.

As another test, you could make a direct IP call from your Snom phone to my Linksys VoIP unit at my direct SIP address while I have Wireshark capturing packets. The call doesn't have to be answered as the SIP exchange will happen either way. I'd just have to know about when to expect the call.

07-22-2008, 05:45 AM	#9
boatman Senior Member Join Date: Jul 2007 Location: Oregon, USA Posts: 365 Thanks: 17 Thanked 77 Times in 64 Posts	I am not sure how to interpret the "Noisy feedback" line, but it seems that your phone may be configured to use tcp transport, normally SIP uses udp transport. The NAT settings on your phone may be wrong, and it may be inserting it's LAN IP address where the public IP address should appear. You can check the NAT settings by calling this SIP number: *0@proxy01.sipphone.com. If it says "you are behind a SIP compatible router" then your NAT settings are probably okay. As another test, you could make a direct IP call from your Snom phone to my Linksys VoIP unit at my direct SIP address while I have Wireshark capturing packets. The call doesn't have to be answered as the SIP exchange will happen either way. I'd just have to know about when to expect the call.