Cisco IP Phone calls doesn't disconnect after the PSTN ends the call. Cisco phone call timer still active and fast busy

[UmaMaheshwaran07]

Cisco Ip phone -->CUCM--(MGCP)--3945 Gateway/ E1 -->Service Provider.  When we make an outbound calls from Cisco phones, calls getting connected properly but when the called party disconnects the calls, we see the calls disconnect but Call timer is still active on Cisco phones and hear fast busy tone. We use MGCP. Any suggestions? Debug ISDN q931 shows disconnect received immediately after the called party ends the call.

[will.alvord]

Please try adding: voice call disc-pi-off

http://www.cisco.com/en/US/docs/ios/12_3t/voice/command/reference/vrht_v1_ps5207_TSD_Products_Command_Reference_Chapter.html#wp1105073

edit: In global config if that wasn't clear

[UmaMaheshwaran07]

Will.alvord

I tried voice call disc-pi-off. It doesn't work. 

[will.alvord]

Sorry about that. I read 'mgcp' but thought 'h.323'. It might be timer-related like someone else suggested, but doesn't sound like it to me. Unfortunately, I don't get to work with many E1 configs, but possibly the 'Convert Progress to Disconnect for User Side PRI EURO' call manager service parameter? 

[shyam2014]

Can you paste the output of command "sh isdn timer"

[Mohammed al Baqari]

can you share debug MGCP packets? we need to see what is happening when you receive ISDN disconnect IE.

[UmaMaheshwaran07]

mohammed al baqari

Service provider says, this is their standard settings and we need to fix it on gateway side. We receive alerting when we end the calls. 

Jul 15 18:12:42: ISDN Se0/0/0:15 Q931: RX <- CALL_PROC pd = 8  callref = 0x8020

Jul 15 18:12:43: ISDN Se0/0/0:15 Q931: RX <- ALERTING pd = 8  callref = 0x8020

Jul 15 18:12:50: ISDN Se0/0/0:15 Q931: RX <- CONNECT pd = 8  callref = 0x8020

Jul 15 18:12:50: ISDN Se0/0/0:15 Q931: TX -> CONNECT_ACK pd = 8  callref = 0x0020 

Jul 15 18:13:13: ISDN Se0/0/0:15 Q931: RX <- ALERTING pd = 8  callref = 0x8020 à I pressed end call on mobile and again I receive Alerting message rather than Disconnect

Jul 15 18:13:13: ISDN Se0/0/0:15 Q931: TX -> STATUS pd = 8  callref = 0x0020

Jul 15 18:13:13: ISDN Se0/0/0:15 Q931: RX <- DISCONNECT pd = 8  callref = 0x8020

Jul 15 18:13:14: ISDN Se0/0/0:15 Q931: TX -> RELEASE pd = 8  callref = 0x0020

Jul 15 18:13:14: ISDN Se0/0/0:15 Q931: RX <- RELEASE_COMP pd = 8  callref = 0x8020

[UmaMaheshwaran07]

%Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 0. Layer 3 output may not apply

    ISDN Serial0/0/0:15 Timers (dsl 0) Switchtype = primary-net5
        ISDN Layer 2 values
         K     =   7 outstanding I-frames
         N200  =   3 max number of retransmits
         T200  =   1.000 seconds
         T202  =   2.000 seconds
         T203  =  10.000 seconds
        ISDN Layer 3 values
         T301  = 180.000 seconds
         T303  =   4.000 seconds
         T304  =  30.000 seconds
         T305  =  30.000 seconds
         T306  =  30.000 seconds
         T307  = 180.000 seconds
         T308  =   4.000 seconds
         T309    Disabled
         T310  =  40.000 seconds
         T313  =   4.000 seconds
         T316  = 120.000 seconds
         T318  =   4.000 seconds
         T319  =   4.000 seconds
         T322  =   4.000 seconds
         T3OOS =   5.000 seconds
         TGUARD=   8.000 seconds, Expiry = REJECT_CALL
         T-activate =   4.000 seconds
        *** dsl 1 is not configured
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[shyam2014]

Could you please run "debug isdn q931" and paste logs for 1 call...need to check all the events and may need to check the isdn timer settings.

[jkalarit]

Basically you have to See the Disconnect Cause code what is  received. CUCM will play the re order tone for Cause code like “82 D6”.  

You may modify the T305 in CUCM if need to adjust the re order tone duration. So it is worth checking the cause code sends by provider and reason for the same if it causes the re order tone.

Best Regards,

Jebin