Forcing Disconnect Cause Code to PSTN - MGCP Gateway

[abraham23482]

Hi,

We have a toll free number and the Telco routes calls to this in a round robin way with calls hitting a DID number on a PRI in Site-1 and if all channels are occupied on this PRI then the call goes to another DID number on a PRI in Site-2.

The roll over is not working (this is day 1 so never worked). The telco says that we are not sending them the correct codes, specifically, 17,34 and 41 when all channels are occupied.

Could you please let me know how we can do that on a MGCP Gateway with T1 PRIs

Thanks in advance.

Abraham

[Dennis Mink]

That sounds like bull mate, think about it. You have a PRI in site 1, consisting of 32 channels.  so if you offer 32 concurrent calls from your Telco into your PRI that means that PRI has reached its full capacity right?

Then why would the Telco attempt to add a 33rd call to this same PRI, waiting for the far end (i.e. your MGCP gateway) to signal a specific code to to inform the Telco that capacity has been reached?  After which the telco concludes to failover to site 2 to attempt the same again.

to be honest, push back. If your Telco offers this as a service, they should be able to tell the requirements on your end.

codes user busy and no channel available are pretty stock standard ISDN codes, have done debug isdn q931 to verify what it is actually sending?

[abraham23482]

So they came back and said the channels on the first PRI is not filling up but the calls are getting dropped since the CUCM is sending a Call Reject cause 41.

Traced a call and found the same error log.

2016/03/30 09:30:47.494|CC|REJECT|93629115|0|215357XXXX|5395|5395|41

[Dennis Mink]

when you say "So they came back and said the channels on the first PRI is not filling up"  does that mean like the first call coming in on an otherwise unused PRI?

If you say its coming from CUCM, have you looked at CUCM traces, to see why its itstructing MGCP to send that code?