Steven DiStefano Wed, 04/28/2010 - 11:42
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Usually bandwidth constrained.  Knowing the symetrical SLA the SIP trunk SP guarantees to the demarcation router at the UC500 site will usually dictate how many you want to allow, minus some reservation for data perhaps, using CAC (configured with CCA).

Steven DiStefano Wed, 04/28/2010 - 12:13
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G711 Preferred?   Figure approx 87kbps bi directional per call (64kbps + Ethernet overhead + L3 IP overhead)

G729 negotiation?   COmpression lends more bandwidth for calls as it only needs about 32kbps per call...

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


Leaving some bandwidth for data only is a good idea, so you can set CAC in CCA to a max number of calls to 'reserve some for data'.  Not to be confused with QOS which will always give priority to voice signaling and media over data.  What you want to protect is the ability for some data to get through too :-)


Steve

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