Disconnect Cause=33 ?

[arielroza]

Hi, guys and gals.

Does anyone know what a Disconnect Cause=33 means?

I am receiving this on calls placed to the PSTN from a 2851 gateway passing through a Siemens PBX? I don´t see that code tabulated in Cisco´s voice documentation. My calls establish themselves, but get cut at random intervals.

Doing a Q931 debug returns

Jul 22 21:26:47.000: ISDN Se0/0/0:15 Q931: RX <- DISCONNECT pd = 8  callref = 0xC77A
        Cause i = 0x80A181 - Unknown cause value

I am assuming the code is generated by Siemens.

Regards,

Ariel

[Phillip Ratliff]

I'd guess that is them responding to a cause that was sent outbound to the Siemens.   Can you post the full debug (with edited numbers for privacy of course)?

[arielroza]

This is the Debug:

Jul 22 21:25:03.525: ISDN Se0/0/0:15 Q931: Sending SETUP  callref = 0x4778 callID = 0xFDB7 switch = primary-qsig interface = User 0xC778 }
Jul 22 21:25:03.525: ISDN Se0/0/0:15 Q931: TX -> SETUP pd = 8  callref = 0x4778
        Sending Complete
        Bearer Capability i = 0x8090A3
                Standard = CCITT
                Transfer Capability = Speech 
                Transfer Mode = Circuit
                Transfer Rate = 64 kbit/s
        Channel ID i = 0xA9839E
                Exclusive, Channel 30
        Calling Party Number i = 0x0081, '12XXX'
                Plan:Unknown, Type:Unknown
        Called Party Number i = 0x80, '0155017XXXX'
                Plan:Unknown, Type:Unknown
Jul 22 21:25:03.717: ISDN Se0/0/0:15 Q931: RX <- CALL_PROC pd = 8  callref = 0xC778
Jul 22 21:25:06.905: ISDN Se0/0/0:15 Q931: RX <- PROGRESS pd = 8  callref = 0xC778
Jul 22 21:25:06.921: ISDN Se0/0/0:15 Q931: RX <- PROGRESS pd = 8  callref = 0xC778
Jul 22 21:25:06.949: ISDN Se0/0/0:15 Q931: RX <- ALERTING pd = 8  callref = 0xC778
Jul 22 21:25:14.754: ISDN Se0/0/0:15 Q931: RX <- CONNECT pd = 8  callref = 0xC778
Jul 22 21:25:14.754: ISDN Se0/0/0:15 Q931: TX -> CONNECT_ACK pd = 8  callref = 0x4778
Jul 22 21:26:46.972: ISDN Se0/0/0:15 Q931: RX <- DISCONNECT pd = 8  callref = 0xC778
        Cause i = 0x80A181 - Unknown cause value
Jul 22 21:26:46.972: ISDN Se0/0/0:15 Q931: TX -> RELEASE pd = 8  callref = 0x4778
Jul 22 21:26:47.092: ISDN Se0/0/0:15 Q931: RX <- RELEASE_COMP pd = 8  callref = 0xC778
        Cause i = 0x8090 - Normal call clearing

As I see, the Disconnect comes from the Siemens Side

Regards,

Ariel

[Phillip Ratliff · Accepted solution]

You are correct the far-end is sending the disconnect and not providing a reason.

Were you a part of this call?  It looks like the call was up for some time before it got dropped but you'll have to do some debugging on the PBX to see the real reason the call was ended.

-ryan

[arielroza]

Thanks, Ryan!

That´s all I needed to confirm. The PBX is managed by another provider, I already passed the request, but was needing to confirm my suspicions.

Regards,

Ariel.