[c-nsp] ISDN Timer Problem?

[John Gao]

Hi All,

We observed the following symptom on an AS5350 running 12.3(10e).

The gateway sends an outbound voice call via ISDN.  It receives an call 
proceeding message from the telco.  After exactly 9 seconds, the gateway 
disconnects the call.  See 'debug isdn q931' output below:

Nov 24 10:54:00: ISDN Se3/1:15 Q931: TX -> SETUP pd = 8  callref = 0x4A63 
        Sending Complete 
        Bearer Capability i = 0x9090A3 
                Standard = CCITT 
                Transer Capability = 3.1kHz Audio 
                Transfer Mode = Circuit 
                Transfer Rate = 64 kbit/s 
        Channel ID i = 0xA9839D 
                Exclusive, Channel 29 
        Progress Ind i = 0x8283 - Origination address is non-ISDN  
        Calling Party Number i = 0x2183, 'xxxxxxxx' 
                Plan:ISDN, Type:National 
        Called Party Number i = 0x81, 'xxxxxxxxxxxxx' 
                Plan:ISDN, Type:Unknown
Nov 24 10:54:00: ISDN Se3/1:15 Q931: RX <- CALL_PROC pd = 8  callref = 0xCA63 
        Channel ID i = 0xA9839D 
                Exclusive, Channel 29
Nov 24 10:54:09: ISDN Se3/1:15 Q931: TX -> DISCONNECT pd = 8  callref = 0x4A63 
        Cause i = 0x8090 - Normal call clearing
Nov 24 10:54:10: ISDN Se3/1:15 Q931: RX <- RELEASE pd = 8  callref = 0xCA63
Nov 24 10:54:10: ISDN Se3/1:15 Q931: TX -> RELEASE_COMP pd = 8  callref = 0x4A63

While the telco fails to send us a progress or alerting message for 9 
seconds, I thought there is a way to change the ISDN timer (e.g. T310).  
However all timer settings look alright to me.  They are all set to 
default too.

    ISDN Serial3/1:15 Timers (dsl 1) 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

I also tried increasing the T310 value to 45000 ms but it didn't make any 
difference.

Can anyone shed some light on this one?

Cheers

John