Hi David,Try to ask your VoIP provider to change the refresher. Also if you still having a service contract (Smartnet) of your 2851 you can install IOS 15.4M7 and open a support case.Please let me know if you problem could be solved with your provide...
Hi,I had the same problem with router 2821. I used the last IOS version 15.1(4)M7 but the problem was not solved. As MOHIT SINGH said. The default timer for sip session is 1800 sec. and a re-Invite is sended at the middle time. When I receive the re-...
Hi,I am in the same situation. But I think I have a solution, If we migrate from SCCP to SIP if you enable Group Listen in the SIP phone template, the phones will enable the function.Regards,