I have a system that is driving me nuts. My customer is running Asterisk 1.4.20.1 on a CentOS 5.2 server. It is a purely SIP and IAX2 service with no cards installed and it uses ztdummy from Zaptel 1.4.11. They use Teliax for calls to the USA and Protel for calls in Mexico.
The problem is that users complain that their calls get dropped. Sometimes every few minutes and sometimes after a very long call over two hours so there is no clear pattern. There is a very strange behavior when some of the calls are dropped. Some of these users call a conference bridge, when their calls get dropped they will immediately dial back and be connected to the same conference without having to put in their PIN numbers, as if the call just dropped on their phones but Asterisk kept the channel open and then reconnected the phone. Some others redial to the same conference and when they log in they realize that their old call is still active and it gets dropped after a few minutes. I am having a big problem trying to diagnose why the calls get dropped. I do not know if it is the phones, Asterisk or the VoIP provider. What tools would you use to determine the cause of the disconnection? -- Telecomunicaciones Abiertas de México S.A. de C.V. Carlos Chávez Prats Director de Tecnología +52-55-91169161 ext 2001
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