We have Avaya G450 with S8300 and two MM711 modules in a site. There are 07 PSTN lines connected in one MM711 module and the communication manager is configured with basic inbound outbound calling. The client sometimes face crosstalk with PSTN calls, for example Phone A is already talking on PSTN line and Phone B tries to get outside line by pressing 9 it will get the same line Phone A already connected on. This problem is random and occurs with around 20% of the outbound calls. We need urgent solution to this as site is in production.
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Are your mm modules/gateway on the latest firmware for your release ?
Have you had a look at the "show faults" command from the cli of the gateway?
Does CM show any errors or alarms relating to this ?
If you run a list trace when this happens does it actually show the behaviour you describe ( accessing a line that is already in use) , this would be easily identified using the "status station"(station on active call) and "list trace" (station trying to call out) , multiple sat session can be achieved with a programme such as putty/tutty.
I would try this trouble shooting first and post back your findings.
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