For anyone reading this, I have searched high and low and I am really interested if anyone has any thoughts. We have many different sites and are trying to impliment VoIP at a few of these sites. We are currently running Cisco Call Manager 3.2 currently and I have purchased an ata 186 device to connect our remote site.
At our main site we have a 3640 configured for 2 remote locations with voice configured and about 156 other locations all using frame relay. At the site I am trying to connect the ATA I have a 1720 router with a 56k FR link, with 56k CIR. I am also testing this at another site with 56k FR and 8k CIR. I followed the LLQ procedures and now have that working.
After I got that working I set my voice policy to priority 45 as it says in those procedures and watch packets on the "Show frame-relay fragment" command I think it is, and notice when im on the phone the voice is choppy and it keeps adding packets to the "Dropped" portion of that policy.
So what I have assumed from this is that my LLQ policy is fine (and the voice is much better then when I didn't have the policy) but I don't think I am really using G729a that I want the ATA to be using. So I have looked around and the only thing I can think of is setting up a dial-peer on our main 3640 to use codec g729a for that remote location exclusively. So two questions, first am I forgetting anything? is there another reason this would be dropping packets off of the QoS Policy? Second when I set up the dial peer am I setting it up as VoFR or VoIP cause the box has an IP address to it and/or is that what is happening and/or is that the only way to get it to work and be sure its really using G729a. Any advice would be greatly appreciated.
Frank, its important to know what codec you are using and how many concurrent calls are going through at a time. even if youre using g729 you are using 24 K per clal and if you have two calls then that is oversubscribing your priority map.
A good way to check is to do a show policy map and see where the drops are occuring. If your voice queu is dropping packets youre in trouble.
I looked at that policy map and it is dropping packets in the voice queue. We only would have 1 concurrent call at a time. I would figure a 56k/56k line should be able to hold that one call fine and quality should be good, but it still dropping so I suspect its not really using G729a its trying to use something else and thats why its dropping packets.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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