PCA Call Dropouts after 10-12 seconds

[Egghead2]

Hi All,

I am running a CS1000 Rel 5.0, E1 ETSI PRI and using PCA to send incoming calls to user deskphone and to their mobile phone (cell) simultaneously. The actual call routing all works Ok as both phones will ring at the same time. The problem I am having is that the call to the mobile phone will drop after a period of 10 - 14 seconds, but the call still rings on the desk phone and can be answered. I have done various DCH traces and can see that the PABX is sending a DISC message to the network. Traces are as follows;

Trace #1

Call successful. Ext 2480 was setup as straight callforward no answer to mobile, and not using PCA.

You can see the messaging flow as follows;



OMSG CC_SETUP_REQ <------- call setup request from PABX to network

IMSG CC_PROCEED_IND <------- call proceeding indication from network

IMSG CC_ALERT_IND <------ call alerting indication from network

IMSG CC_SETUP_CONF <------ call setup confirmation from network

OMSG CC_DISC_REQ <------ call disconnect message from PABX





Trace #2

Call Fail. Mobile call to ext 2480 (a new PCA extension that I setup) using PCA to send call external to mobile.



OMSG CC_SETUP_REQ <------- call setup request from PABX to network

IMSG CC_PROCEED_IND <------- call proceeding indication from network

IMSG CC_ALERT_IND <------ call alerting indication from network

OMSG CC_DISC_REQ <------ call disconnect message from PABX





Trace #3

Call Fail. Mobile call to ext 2486, using PCA to send call external to mobile.



OMSG CC_SETUP_REQ <------- call setup request from PABX to network

IMSG CC_PROCEED_IND <------- call proceeding indication from network

IMSG CC_ALERT_IND <------ call alerting indication from network

OMSG CC_DISC_REQ <------ call disconnect message from PABX

I have spoken to Nortel and they suggest I change the T310 or T203 timers on the DCH in LD 17. I have looked at Nortel NTP's and have found some conflicting information as to what these timers do. Has anyone else had this problem and which timers should I be extending and what the timers do.

 

[Egghead2]

Hi All,

An update and solution found for this PCA issue. After a bit of testing in the lab, I have found that the timer controlling the time for the PCA call to the mobile is the RCO parameter on deskphone TN. This was set at RCO 0 which in LD 15 was set for 4 ring cycles at CDB - RDR - CFN0 and DFN0. I changed both CFN0 and DFN0 to 10 ring cycles and the call then rang on mobile for more than 10 seconds and was able to be forwarded to mobile VMAIL.

 

[SL1M1]

But that will effect all TN's with RCO '0' you could assign an CFNx/DFNx/RCOx for just the PCA solution, but thats not so much a timer just relates to ring cycles.

The other timers would be in the RouteDataBlock (TIMR)EOD would probably need maxing out

Cheers!!