atcomsystems.ca/forum Forums TDM Business Telephone Systems Comdial Telephones & Systems Comdial DXP - PRI Issues (echoing bad)

I was afraid to ask but someone still complained about echo on Wed, so its still there. We're officially switching carriers at this point.

The carrier has now offered to swing in 2 new PRIs, to (from what I understand) switch OFF of their native network (prob running VOIP) to another carrier who they partner with (probably Verizon). While that would have been an option if they offered to do that 10 days in, we are now practically 45-50 days in and getting responses back from them has been like pulling teeth.

From what I understand in talking to some of the telcos (and getting some inside info), that indeed we were prob switched over to a softswitch. As I mentioned earlier Starvox is primarily a VOIP network so they're prob routing all our long distance over a VOIP platform. All the symptoms are synonomous with VOIP.

So at this point, no the problem was never actually fixed, but hopefully a new carrier will resolve the issue.

Well...4-5 months later, we switched to Verizon, and the echo is back. I'm at a loss. Anyone know what could cause echo and dropped calls? Doesn't happen as much as it used to but still happens.

Would a CSU on the PRIs help?

well you said you had two pris. have you pin pointed what card your calls are going out on that give you the echo? see if you can change your cards in your switch around and see if thats help. maybe you can pin point it to a card. if that don't work have the telephone company then put a t-bird on the pri if they can and see what they find. thats what i would do just my two cents

It seems to be both cards. They're sort of set up in a round-robin scenerio where incoming calls start on channel 1 of the first pri, while outgoing start on the last channel of the second PRI.

As an update...in going through EVERY setting, I found the switch protocol is set to DMS100, it should be 5ESS. Son of a ....

are you xxxxxxx kidding me?

Is that really what was the Issue the entire time?

Sigh....well that was short lived. My partner called me for something this morning while I was driving in and in the middle of talking she said "wow do you hear that echo??" (I couldn't hear it but she could hear herself).

@##$#@$@#%@!!!!

So apparently changing the switch protocol didn't help. It was prob just wrong since we switched to Verizon, but amazingly the lines were connecting fine.

Per our vendor, we're going to try bumping the transmit padding down 2 notches to see if that helps.

As for the dropped calls...I believe I was the culprit there. I was setting the default outbound caller ID setting under the ISDN board screen, and didn't realize it reboots the boards when you apply the settings. I prob killed all kindsa calls that day ;-)

Through all of this, have you been looking for chronic problems in the T1 log on the system?

Adjusting the padding may be a good place to go. Good idea on your vendor's part. It seems like you've described the echo as being uni-directional, so you should be able to adjust one side and have some sort of affect on the echo.

Justin