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New Member

Can I have 2 calls from remote site over 64K channel?

Hi,

Can any one tell me if i can have 2 simultaneous calls over an 64K channel if on remote site they originate from phones connected to an ATA-186 adapter (configured to use G.723 codec( ?

I have over 10 remote offices, with the analog phones connected eiter to FXS ports or to ATA-186 adapters.

the ata registers to a H.323 Gatekeeper.

thanks for help,

Marcel

5 REPLIES
Cisco Employee

Re: Can I have 2 calls from remote site over 64K channel?

Marcel,

You dont say if you are using g.723(5.3) or g.723(6.3) but from the bandwith calculator.(http://tools.cisco.com/Support/VBC/do/CodecCalc1.do)

I ran through it and see that it will be about 10kbps per call depending upon payload size and encapsulation, use the calculator for a more exact answer for your situation.

New Member

Re: Can I have 2 calls from remote site over 64K channel?

the bw calculator gave me about 25kbps for 2 calls, using G.723 (6.3) with my parameters.

the question is: how will the GK know how much of bandwidth is using each call from the ATA? Based on what? (I have a freeware GK, H.323 compliant.)

how will IOS GK deal with it?

BR,

MArcel

Cisco Employee

Re: Can I have 2 calls from remote site over 64K channel?

This URL has some good info on how the GK does it's BW calculations and how it all works:

http://cisco.com/en/US/tech/tk652/tk701/technologies_white_paper09186a00800c5f67.shtml

Hope this helps....

New Member

Re: Can I have 2 calls from remote site over 64K channel?

Hi Marcel,

I am not familiar with Codec Calculator. Would you tell me what is your initial parametars about your link that you have set up ?

Regards

Kamen

New Member

Re: Can I have 2 calls from remote site over 64K channel?

essentially, the question is very simple. have somebody done this:

place more than 1 call simultaneously, over a 64K channel, from phones connected to ATA, while ATA is registered to a Gatekeeper. (theoretically, and practically, it should work if I use G.723 codec)

I did not succeeded.

It worked (with G.723 codec) between 2 sites with ATAs, without GK.

When I start the GK (and the ATAs r registering to) it doesn't work - the first call is considered by GK as consuming the whole 64K (this parameter is indicated in the ARQ - BandWidth: 640 (0x280) - of the ATA). So no other calls are permitted. !!!!

have the debug and ATA config if needed.

Marcel

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