10-25-2013 12:43 AM - edited 03-16-2019 08:04 PM
Hi all.
Yesterday i faced with problem:
Ringing tone is generated to IpPhone1(from CUCM i guess) while call declined by customer.
Design
IpPhone---CUCM---SIPtrunk---Redundant Voice gateways---E1 PRI --- PSTN---Customer Phone
On the voice gateway:
debug isdn q931
i see message "Busy received" and channel is cleaned.
But even after channel clearing IPphone keep receiving ringing tone for about 30 sec.
If call is answered - no problems. Normal clearing and call termination.
If no channels available or all ports are shutdown no rerouting via redundant gateway occur.
I guess Voice gateway do not send some important message or waits for some event but i cant firure up for what. Maybe i missed something important in config.
Configuration of Voice GW is appended.
Any help is greatly appreciated.
Solved! Go to Solution.
10-25-2013 02:24 AM
Hi oleg.
add voice call disc-pi-off to your config.
HTH
Regards
Carlo
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"The more you help the more you learn"
10-25-2013 02:29 AM
From the logs,
When the Telco sends a disconnect, it sends a PI (progress indicator-perhaps plays a prompt rather that the usual disconnect), hence as far as the gateway is concerend the call is still in progress and therefore does not send a disconnect to cucm
Oct 25 09:00:00.042: ISDN Se0/0/0:15 Q931: RX <- DISCONNECT pd = 8 callref = 0x80A1
Cause i = 0x8491 - User busy
Progress Ind i = 0x8288 - In-band info or appropriate now available
*Oct 25 09:00:00.042: ISDN Se0/0/0:15 Q931: call_disc: PI received in disconnect; Postpone sending RELEASE for callid 0x8041
Detailed explanation of this is below:
The debug Isdn q931 command output shows this message when the Public Switched Telephone Network (PSTN) user hangs up the call:
ISDN Se1/0:15 Q931: call_disc: PI received in disconnect; Postpone sending RELEASE for callid 0x8012
Issue the voice call disc-pi-off command on the gateway so the gateway treats a disconnect message with a Progress Indicator (PI), as it treats a standard disconnect without a PI, (issue the voice call disc-pi-off command in global configuration mode).
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"opportunity is a haughty goddess who waste no time with those who are unprepared"
10-25-2013 01:02 AM
Oleg,
This is not the first time I have see this. It seem to be common to sip trunks...
Can you do a test call and send the ff:
debug isdn q931
debug ccsip messages
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"opportunity is a haughty goddess who waste no time with those who are unprepared"
10-25-2013 01:29 AM
10-25-2013 01:55 AM
Can you please enable the debigs together. I need to correlate isdn logs to sip logs...
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"opportunity is a haughty goddess who waste no time with those who are unprepared"
10-25-2013 02:12 AM
10-25-2013 02:24 AM
Hi oleg.
add voice call disc-pi-off to your config.
HTH
Regards
Carlo
Please rate all helpful posts
"The more you help the more you learn"
10-25-2013 02:29 AM
From the logs,
When the Telco sends a disconnect, it sends a PI (progress indicator-perhaps plays a prompt rather that the usual disconnect), hence as far as the gateway is concerend the call is still in progress and therefore does not send a disconnect to cucm
Oct 25 09:00:00.042: ISDN Se0/0/0:15 Q931: RX <- DISCONNECT pd = 8 callref = 0x80A1
Cause i = 0x8491 - User busy
Progress Ind i = 0x8288 - In-band info or appropriate now available
*Oct 25 09:00:00.042: ISDN Se0/0/0:15 Q931: call_disc: PI received in disconnect; Postpone sending RELEASE for callid 0x8041
Detailed explanation of this is below:
The debug Isdn q931 command output shows this message when the Public Switched Telephone Network (PSTN) user hangs up the call:
ISDN Se1/0:15 Q931: call_disc: PI received in disconnect; Postpone sending RELEASE for callid 0x8012
Issue the voice call disc-pi-off command on the gateway so the gateway treats a disconnect message with a Progress Indicator (PI), as it treats a standard disconnect without a PI, (issue the voice call disc-pi-off command in global configuration mode).
Please rate all useful posts
"opportunity is a haughty goddess who waste no time with those who are unprepared"
10-25-2013 02:54 AM
+5 Carlo. Keep the good work going.
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"opportunity is a haughty goddess who waste no time with those who are unprepared"
10-25-2013 03:04 AM
..and +5 to Aok for always giving excellent and detailed answers.
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"The more you help the more you learn"
10-25-2013 03:30 AM
TY guys. Now busy calls are threated correctly.
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