[c-nsp] ISDN Timer Problem?

John Gao john.gao at globaldial.com
Wed Nov 23 23:26:04 EST 2005


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


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