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Communication problems over IP phone

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??

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Re: Communication problems over IP phone

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 Firmware Levels Outdated firmware in routers, VOIP phones, Firewalls, etc.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 ---- firewall ---- asterisk Troubleshooting Steps Start capturing at point Make a VOIP call that will have one-way audio Analyze capture If problem found, fix and retest Otherwise move capture point to the next point (a, b, c, d, etc) and start over If the problem is intermittent, then a long term simultanous capture at multiple points can be used to attempt to capture a comple call with the problem. Most capture tools will let you capture only traffic from selected devices, so the volume of captured information can be kept to a reasonable size. If a back-to-back SIP user agent (for example a Session Border Controller ) is part of of the call path, then it may be necessary to capture all VOIP traffic at some points to ensure catching the wanted call since the IP addresses can change when traversing this device. Resources How To Debug and Troubleshoot VOIP

Posted on Oct 10, 2007

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