g.729 3rd party VOIP on Cisco routers QoS - am I doing it right?
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robbieg
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g.729 3rd party VOIP on Cisco routers QoS - am I doing it right?
Networking, Ethernet, Network protocols, Cisco, Routers, IPv4, TCP, Bandwidth, Availability, VoIP, SIP
Hi,
I am unsure about which configs are sufficient for implementing QoS on 2 2600 series routers over a 2MB serial link. On one side is the IP pbx and there are up to 6 IP phones plugged into a switch on the other side.

We are using a non-cisco VoIP product using g.729. From what I can see all I need to do is put the following commands on the serial interface's of both routers (where "70" referring to 70Kbps should be enough for 6 calls?):

bandwidth 2000
ip rtp header-compression
ip rtp reserve 16384 100 70

I have a few questions:
Is this right?
What about the Ethernet interfaces? Do they need commands to prioritise the traffic on the ethernet interface?
We have looked at the traffic used on the phones and they use ports around 7000-8000 for actual voice packets...but the advice I read says that the command (ip rtp reserve 16384 100 70) covers it all (16384 +100)???

Thanks for any help in advance.

Rob.
ASKED: Mar 6 2006  4:56 AM GMT
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paul144hart
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Are you able to get the phones to ring on the other side? I would first wonder if the 2600 will pass the invites and so on through successfully.
Last Answered: Mar 6 2006  3:50 PM GMT by paul144hart   0 pts.
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robbieg   0 pts.  |   Mar 7 2006  3:18AM GMT

Hi, Maybe I didn’t explain myself properly. We haven’t actually implemented this yet just checking that I am doing it right. Thanks anyway! HAve you done this?

 

paul144hart   0 pts.  |   Mar 7 2006  12:43PM GMT

Something like it but used the AS5350 gateways (VoIP - ISDN lines). But since you are using g.729 you’ll need to look into the out of band signalling to make sure its not blocked. The other traffic running out the ethernet interfaces should worry about the switches they run on - do they have QoS for rtp traffic? If there at their maximum you may want to seperate the VoIP traffic.

PS: I assume the 2MB link has more than calls on it?

 
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