How do I size data circuits to prepare them for CUCM deployment?

[JimPatch01]

We've deployed CUCM at out main facilities and are preparing to deploy to a variety of smaller, remote sites ranging in size from 5 to 200 phones. I need to know a way to size the data circuits to be able to support the added voice traffic. We do not have QOS configured, and probably will not prior to deployment. I realized that traffic, whether the site is a heavy CCX environment will have an impact, but I really need a "rule of thumb" "10 phones= 5 meg, 100 phones = 10 meg, etc...   Does anyone have a formula?

Thank you.

Regards,

Jim Patch

[Jagpreet Singh]

HI Jim,

     When making calls from site to site, we always suggest that the G729 codec be used. You can allocate the BW according to :

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml

Regards,

Jagpreet

[Gert Vanderstraeten]

Jim,

Depends you technology like MPLS for example. But as a rule of thumb, use 24k/channel for G729 and 80k/channel for G711.

Gert

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[Jaime Valencia]

There's no thumb rule, you need to do some math based on number of calls and kind of technology you'll be using, protocol, codec, etc

Bandwidth Provisioning

http://www.cisco.com/en/US/partner/docs/voice_ip_comm/cucm/srnd/9x/netstruc.html#wp1165070

Voice Codec Bandwidth Calculator

http://tools.cisco.com/Support/VBC/do/CodecCalc1.do

Voice Over IP - Per Call Bandwidth Consumption

http://www.cisco.com/en/US/partner/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml

Bear in mind you also need to configure CAC in CUCM and QoS to make sure RTP/signaling gets the right priority.

HTH

java

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