[cisco-voip] Question: What version of CUCM extends the RTT window for Wan clustering subscribers.

[Jorge L. Rodriguez Aguila]

Cisco "Relaxed" from 40 to 80 on 6.1


*Delay

The maximum one-way delay between any two Unified CM 6.0 servers should not exceed 20 msec, or 40 msec round-trip time (RTT). Beginning with Cisco Unified CM Release 6.1, the maximum one-way delay between two Unified CM servers can be up to 40 msec, or 80 msec round-trip time. Measuring the delay is covered in Delay Testing<http://www.cisco.com/en/US/partner/docs/voice_ip_comm/cucm/srnd/6x/models.html#wp1044078>. Propagation delay between two sites introduces 6 microseconds per kilometer without any other network delays being considered. This equates to a theoretical maximum distance of approximately 3000 km for 20 ms delay or approximately 1860 miles. These distances are provided only as relative guidelines and in reality will be shorter due to other delay incurred within the network.

Jorge Rodríguez Aguila
CCNA,CCVP
Senior Network Consultant
Netxar Technologies
jorge.rodriguez at netxar.com
Office 787-765-0058
PCS 787-688-8530
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From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Grisham, Tom
Sent: Friday, March 14, 2008 4:22 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Question: What version of CUCM extends the RTT window for Wan clustering subscribers.

Can anyone share in which version of CUCM that the RTT boundaries will be "relaxed" or "extended" between subscribers clustered over the WAN.  It is my understanding that the 40ms boundary was to be adjusted somewhere in the 6.x or 6.1 Linux platforms.

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