Question about Nortel I2002 IP Phone w/Text Keycaps, No P/S
Hi, Off late we have been facing problems using our IP phones. It was working absolutely fone all these days. The setup is such that we have few branch office locations spread across different cities which are connected through a secure IPsec VPN tunnel over the internet. The problem we've been facing now is, whenever we call the branch office or they call the main office, we hear the ring tone and when we pickup either end of the people are unable to hear anything. Immediately if you disconnect and call again it works fine. This happens quite often for different different extensions at different different locations. We use static IP addressing. The Meridian option 11c our Epabx is setup in the main office. Any clues why this could happen??
I have found many possible causes.
Firmware Levels
Outdated firmware in routers, VOIP phones, Firewalls, etc. can cause one-way audio. Ensure you have the latest updates for all the devices in the call path.
Configuration
Particularly if NAT is involved in the call path, configuration of the various devices may be a problem.
Check to see if all devices are configured appropiately for your envioronment. Has anything changed, carriers harware, quos settings on router ? packet loss to these locations should be tested @ time it happens most, don't use it as gospel retur, ttl and re-xmits' do same..
Bob
Finding the Cause
The basic troubleshooting technique is to use a tool like Ethereal to capture SIP and RTP packets at each point in the call path where packets could be lost. Interperting the resulting captured packets requires some familarity with how networking and VOIP work.
For example if the call path is:
VOIP phone/device ---- firewall ---- sip proxy --
Posted on Oct 10, 2007
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