UCM - minimum BW between servers & endpoints

hoanghiep · ‎05-12-2009

Hi all,

I have a question related to UCM server that needs discussing from you:

What is the minimum BW (and what is the maximum delay) between the server and the endpoints.

I have such the question because we have some remote sites that connect to the central site via 128kbps links.

Thanks,

ivillegas · ‎05-19-2009

The maximum one-way delay between any two Unified CM servers should not exceed 20 msec, or 40 msec round-trip time (RTT). The minimum recommended bandwidth between sites that are clustered over the WAN is 1.544 Mbps.

kelvin.blair · ‎05-19-2009

If running UCM 6.1.2 and above it is 80 msec Round Trip or 40 one way delay between Call Manager servers. For rtp it should not exceed 150ms on way or 300 round trip time. Look at this SRND guide.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/models.html#wp1043996

hoanghiep · ‎05-19-2009

Thanks for reply.

But your answers didnot solve my question! My question is "the minimum bandwidth between the CCM server(s) & the endpoints (IP Phones)).

Any other?

Thanks,

Jaime Valencia · ‎05-19-2009

The SRND answers all your questions,

Bandwidth Provisioning

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/netstruc.html#wp1044772

Fully read this topics

- Provisioning for Bearer Traffic

- Provisioning for Call Control Traffic with Centralized Call Processing

- Provisioning for Call Control Traffic with Distributed Call Processing

HTH

java

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HTH

java

if this helps, please rate