We have a customer with a handful of Sayson/Aastra 480i phones behind a Juniper Networks Netscreen firewall registering with our hosted PBX service.
The Netscreen monitors the REGISTER messages and only keeps the reverse mapping open for the duration of the registration period. It appears that every so often the Sayson does not send out another REGISTER message after the registration has expired resulting in the reverse mapping being closed and the phone made unreachable.
Has anyone else experienced this. We are setting up ethereal to monitor things to collect more information but are hoping others might be able to shed some light on this.
g.
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