I have an IP Communicator that I am trying to register with a CME. The delay between my CME and PC is 290ms. The problem is that the phone registers and after about 2 seconds it unregisters again. I think the problem is as a result of the delay. Does anyone know what can be done to overcome this?
DEFINITELY sounds like a delay issue! There is a note on the Known Issues for IP Com 1.1(5) in this regard: (not directly, but it describes using IP Communicator over a dialup and VPN with low bw and poor audio ....this is exactly what seems to happen as a symptom)
I would try using CME 3.4 and IP Communicator 2.0., as I have this combination working at several customers with no problem. I would also put a sniffer on the back of the IP phone port to see if it is dropping or lagging RTP. Keep in mind that 150ms Delay, as dictated in Cisco VOIP SRND is there for a reason.
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