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Extentions login problems

I have the following problems and i hope some one can help.

1) Some of my extentions shows that they are online even after they are off line for a long period
2) many times when my extentions are online they are not showing online and they can not make calls between them or connect to the server
3) some off the extentions work for a while perfectly and then they show busy status for long time even like 500 minute. i have only to go and disconnect them from FOP

and thanks a lot

First
If you connect a device to a SIP server then disconnect it that device will be 'registered' as far as the server is concerned till the registration expires time has been reached. Normally, this is one hour.

Second
Make sure each device on your network is using Unique SIP and RTP ports.

Third
Firewalling is an issue, and you have not addressed your network configuration whatsoever. If you are behind a NAT router there are some rules you should follow. Open SIP ports to your user agents. Each User Agent should have a unique SIP port (as described above), as well as a unique range of RTP ports.

Which ports are valid for I-P-TEL PBX?