sundance-communications.com/forum Forums TDM Business Telephone Systems Inter-Tel Telephones & Systems Inter-Tel 5000 VOIP problems

Hello everyone! MY company just purchased a new Inter-Tel VOIP system a couple of months ago. We were scheduled to cut to the new system on Friday but cancelled because of excessive jitter. The Inter-Tel qualifier tool shows up to 80ms in jitter. However, our network is clean. Quick setup......office has a switch in it. from the switch we have a point to point connecting us to a data center where all of our servers and pri is located. we did this because of a previous power failure that lasted for many many hours. So we have only a point-to-point that is dedicated only for voice to get us to the data center where our pri, second phone switch, voice mail and unified communicator are located.
Here is the question. Why are we getting 70ms of jitter on a point-to-point connection that has no traffic and tracroutes both directions at 4ms? Has anyone run into this problem before? Could it be a configuration problem on the phone switch? I would like to cut over to this new system but will not do so until the jitter is gone. Any insight to this would be much appreciated. The phone guys installing seem to be unsure! YIKES!!!!

First the PING command uses UDP port 7. Are you running the network qualifier using port 7? Or some other port that can be snagged by an anti-virus or firewall program? Some firewalls and anti-virus stop ports 5566 5567 and 80, and will "introduce" delay to it just by the software itself holding things up. I recommend using the utlities on machines with decent horsepower, and verify it is taking the correct route with, at minimum, a traceroute test. Also remember ping is latency x 2. 4ms is great. 80ms is scary. What type of routers are on each end of your PTP?

I did not know about using the qualifier on port 7. We are not running this point to point through a firewall since it is dedicated for voice within the network. We are using a Cisco 1750 on each side of the point to point. I am using my laptop which has a P4 1.6Ghz processer with 504 MB of RAM as the client. And I am testing to the brand new voice mail server which is extremely beefy. Traceroute verifies that the tes is going ove rthe proper circuit. It also shows that the speed is ~4ms going either way on the circuit to the other sides phone switch.

Here is how the settings are at on the qualifier. Yesterday was my first day to use it.

Server IP Address x.x.x.x
Audio Stream Receive Port 5004
Server call control TCP Port 5566
Audio RTP Type of Service 0