i have got an issue .. i configured IP Phones for one of my customer .. they have one PRI .. whn some one call to those ip phones from outside,some time they hear tone like Fax tone or tone like internet is connectd and some time they can call without any problem .. so how should i trouble shoot this issue !! can any one help me ... i gues this would be issue from service provider but how can i make it sure from my side !!!!
To troubleshoot, I would go down, testing each b channel. Use "show voice call summary" to find out which channel you're on. If you have multiple active calls it will be harder, but "show call active voice brief" can help.
There are two methods to do this:
1) The easiest way is to place a call, test the channel, and place it on hold. The next call will be on the next available channel
2) Place a call, and when you've tested a channel use this command:
isdn busy b_channel
When you have it determined down to see if it's a single b channel or not, it will be much easier to get the provider involved and find out if it's your equipment or the provider. I think there's a slightly better chance it's on the gateway.
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