I have an issue with a Cisco SPA504g handsets connected to an Elastix server.
I have the same issues at two different locations. One location the service phone connects to an SF100D-16P and a Billion 7800NXL. The other location is connected to a Netgear CG3000v2 with nothing else in between.
The elastix server is hosted in a data centre.
This issue is as follows:
- Phones are connected and can make and receive calls
- The internet connection drops offline and then reconnects.
- The modem remains switched on all the time.
- The phone and the Elastix server both act as if they are still connection.
- When I make an outgoing call it still connects.
- Incoming calls will not register on the phone after the loss and recovery of the connection.
- If i restart the handset it recovers and can receive incoming calls or if i restart the phone system the handset can receive calls.
I have tried:
- opening up ports 5000 - 6000 and 10000 - 20000
- I have updated the firmware on the phones to the latest firmware.
- Adjusting some of the SIP Timer settings in the handset.
- Had a cisco online support person log into the phone and check out the settings.
I have been at this problem all day without success.
