Disconnect problems on FXO Groundstart lines

Question

Hello all,
I have a CCME customer, IOS 12.3-11T2. with 6 FXO ground-start lines on a 2821 platform. They are using PVDM2-32’s and two 4Port FXO cards. The call flow goes as follows.
Incoming call from PSTN, hits fxo port which has a “connection plar” to a number which calls a script in CUE. From the script if you press “0” it calls the reception.
All the above works fine.
If the reception hangs up the call and the PSTN party does not right away, the PSTN party hears a repeating click. If the PSTN then hangs up and you do a “show voice port summary” it shows as follows
IN OUT
PORT CH SIG-TYPE ADMIN OPER STATUS STATUS EC
========= == ============ ===== ==== ======== ======== ==
0/1/0 -- fxo-gs up up idle on-hook y
Note that the OPER stat shows “up” and the out status shows “on-hook”
Until that OPER status changes to “DORM” every call after the first one will get answered by this port and the PSTN party will hear the repeating click in their ear. It takes up to 30-40 seconds for the call to clear.
If the PSTN party hangs up first the OPER stat will go to “DORM” almost immediately.
Any thoughts?
Ryan

Answer 1

use the following commands to shorten the time the router waits before determining that the call needs to be dropped due to disconnect tones.
on the voice port
voice-port 1/1/0
timeouts call-disconnect 5
timeouts wait-release 5
these will shorten the IOS default times of 30 sec & 60 sec down to 5 seconds.
use the following link for more info on the FXO disconnect problem.
http://www.cisco.com/en/US/customer/tech/tk652/tk653/technologies_tech_note09186a00800ae2d1.shtml