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New Member

B/W consumption per VOIP call

I'd like to seek opinons from you VOIP men..

In real world how much B/W you'd reserve per VOIP call? Say for routers with voice service using default codec type G729, many says each call would consume around 24kbps(and no. of calls not directly proportional to b/w req'd), I feel different people would have different interpretations and I am rather confused by Cisco's recommendations on this..

Say 4 or 8 concurrent calls are required, how much leased line b/w would be prefered? 128K or 256K?

Thanks in advance,


Cisco Employee

Re: B/W consumption per VOIP call

You are not suppose to use over 75% of the bandwidth for voice per circuit. And yes g729 calls with no header compression are 24k a call. So for 128 with no header compression you can get 4 calls. This uses 96k for calls and leave 1/4 of the bandwidth.

Hope this helps,


New Member

Re: B/W consumption per VOIP call

In the lab, I actually saw the g.729 callsw take 26-27k per call. I actually budget for 30.

New Member

Re: B/W consumption per VOIP call

Thanks for your advice.