PRI Rings?

[np247]

Good afternoon,

We're currently in the midst of migrating away from our traditional PRI's to a SIP trunk attached to a Digium G200 VoIP Gateway, which then connects to another PRI card.
The issue we are seeing is with outbound calls. On our traditional PRI's, if I call a land line/mobile number, within approximately 3 seconds both the local handset and remote number start ringing simultaneously. However, when we make the same calls over our SIP trunk land lines take 6-7 seconds to start ringing, and mobiles generally take 8-12 seconds.

I'm being told by our carrier that essentially this is the expected behavior with SIP. They recommended I configure comfort tone and/or early ring back generation on the PBX to avoid user frustration/confusion -- however, to the best of my knowledge (and our PBX vendors knowledge) such a thing does not exist on the CS1K.

Is this normal? Does the CS1K support this (or similar) functionality? Is there anything else I can do (different appliance maybe?) or am I SOL?

Thank-you!

 

[KCFLHRC]

It's not a CS1K issue and no, there is no such thing in the CS1K as comfort tone. We have a Node configured in our CS1K just for sip trunks with 2 signal servers dedicated to that node and we do not have that issue.

 

[hawks]

Try this dial the number and then instead of waiting 6 seconds just hit the # key and see if the call is sent.

 

[np247]

Thank-you both for your response. That's unfortunate that the CS1K can't provide a comfort tone -- do you know of a SIP Gateway that will (or, if the Digium can)?

I tried the # and below is the results -- it certainly improved, but still room for improvement...

Traditional PRI:
9 + Home = 1 second
9 + Home = 1 second
9 + Cell = 4.5 seconds
9 + Cell = 4.5 seconds

SIP:
9 + Home = 7 seconds
9 + Home = 7 seconds
9 + Cell = 14.5 seconds
9 + Cell = 12 seconds
9 + Home + # = 3 seconds
9 + Home + # = 3 seconds
9 + Cell + # = 8.5 seconds
9 + Cell + # = 8 seconds

 

[KCFLHRC]

How is the PRI programmed between the CS1K and the SIP Gateway? NI2?

 

[np247]

Correct, NI2.

 

[KCFLHRC]

One side set up for user and one for net? Probably the Gateway as the net and the CS1K as the user? I'm not sure there is anything you can do. Maybe mess with the EOD Timers but that's a crap shoot. The # is basically telling the CS1K that you are done dialing.

 

[np247]

Unsure about the first part; that was all provider setup.
Speaking to our PBX vendor he indicated he will try dropping the end of dial timer as low as it will go so hopefully that will help.
8.5 seconds of dead air still doesn't feel right though...