Call Bandwidth Overhead

[Jamie Weatherhead]

Hi All,

If I were to place an internal call from our main site to one of our branches across our managed WAN, would to total bandwidth consumed be 80kb or 160kb assuming each of the phones in question were using G711 as their Codec?

Thank you.

Regards

Jamie

[Rob Huffman]

Hi Jamie,

It would be 160kb Have a look at this good tech note;

Voice Over IP - Per Call Bandwidth Consumption

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

and you can also leverage this Cisco TAC tool;

Voice Codec Bandwidth Calculator

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

Cheers!

Rob

[acampbell · Accepted solution]

Hi,

You really need to look at this

The 160 is bytes in the payload

The call consumes about 80 -90 Kbps depending on the media eg frame-relay ATM , Ethernet.

Here is the stats from a call G711 I have in my 3750 Lan switch right now

Queueing strategy: fifo

  Output queue: 0/40 (size/max)

5 minute input rate 89000 bits/sec, 50 packets/sec

  5 minute output rate 91000 bits/sec, 52 packets/sec

     4686999 packets input, 762427991 bytes, 0 no buffer

I hope this is clear

HTH

Alex

[Jamie Weatherhead]

Thanks gents,

Most helpful.

Regards,

Jamie

[Rob Huffman]

Hey Alex,

Thanks for clarifying this buddy +5

Hope all is well with you!

Cheers!

Rob