CAS E&M Wink Start calls failing after connection for 3 minutes

[ocampbell]

I am expereincing calls failing over CAS T1 using E&M Wink Start. The calls connect,but after 3 minutes the line goes to fast busy tone. The gateway is a 1760 Router 12.3(11)T3 with MFT-T1 card.

Controller t1 2/0

ds0-group 1 time 1-24 type e&m-wink-start

dial-peer voice 910 pots

destination 91..........

prefix 1

direct-inward dial

port 2/0:1

show voice call summary shows port in a WAITFOR_ANSWER mode and finally disconnects.

For the user the call is connected and operatiional for 2-3 minutes.....

Any suggestions??

Thanks,

Owen

[vmoopeung]

Could you please try any of these commands to find the problem.

debug isdn q931

debug isdn events

debug cdapi events

debug cdapi detail

debug dialpeer

debug tsp all

debug voice ccapi inout

debug cch323 h225

debug h225 events

[dgahm]

The router is waiting for connect supervision (E lead asserted) from the other side.

Is this a new install? I have seen this problem at a couple locations when connecting with Nortel DMS10 switches. The config on the Telco side was the problem.

[maharris]

You could try setting progress_ind:

These are the ones I have seen mentioned, in discussions of people having problems with calls disconnected in a fixed time period. They need to go on the outbound dial peer, so if these calls are going out the pots port, they would go on the pots peer.

progress_ind alert enable 8

progress_ind progress enable 1

progress_ind connect enable 1

progress_ind disconnect enable 8

Mary Beth

[maharris]

But, if this worked, it would be a cheat, as it appears signalling is not happening as it should be on the CAS link, as pointed out by dgahm above.

Mary Beth

[maharris]

Here is a good description of what should be happening:

Wink start is used to notify the remote side that it can send the Dialed Number Identification Service (DNIS), also referred to as the Called Number.

For an incoming call (network to router), this occurs:

1. Network goes off-hook. ABCD bits = 1111.

2. Router sends wink. ABCD bits transition from 0000 to 1111 for 200 ms, then back to 0000.

3. Network sees the wink, and then proceeds to send DNIS (Called Number) information. This is done when inband multifrequency/dual tone multifrequency (MF/DTMF) tones are sent, which are decoded by the DSPs.

4. Router goes off-hook when the call is answered. ABCD bits = 1111.

5. Audio path is opened, parties can talk, and the billing system registers a call start record.

In an outgoing call (router to network) the same procedure occurs, but the network and router switch roles. The reason is that the signaling is symmetric.

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00801123bb.shtml#topic1a

Mary Beth