I'm having trouble getting a Cisco 7911 or 7941 phone to stay registered in a CME environment where the link latency is on the order of 250 mS each direction. The phones will appear to have registered as indicated by messages at the router console, but within 2 seconds, an unregistered abnormally message is seen. The message flow as seen by Wireshark looks the same as a normal registration up until the router closes the control connection on port 2000. This sequence repeats over and over again as long as the phone is powered.
Can anyone provide some insight on what might be going on and what I can try to sort this out? I could swear I was told that CME would work over SATCOM links. What have I gotten wrong?
Thanks in advance for clues, insights, and solutions.
Look at packet number 87. This is the first place an unsuccessful registration differs. Note that the router (192.168.130.1) is dropping the control connection ~240 mS after sending a SoftKeySetResMessage. Also note that the ACK does come, but after 470 mS.
Is there a way to make the router more tolerant of high latency links???
No there isn't. This isn't a router issue, but a VoIP issue. VoIP does not like high latency links and anything greater than 250ms will affect voice quality so SEVERELY that it isn't usable. You really want latency less than
150ms as even at that level it is noticeable to callers.
"JohnInRochester" wrote in message news: snipped-for-privacy@c4g2000hsg.googlegroups.com... On Jan 10, 4:52 pm, Merv wrote:
Look at packet number 87. This is the first place an unsuccessful registration differs. Note that the router (192.168.130.1) is dropping the control connection ~240 mS after sending a SoftKeySetResMessage. Also note that the ACK does come, but after 470 mS.
Is there a way to make the router more tolerant of high latency links???
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