Q931 Set up Messages

craigneeld · ‎06-16-2009

Hey All,

Does anybody know where all this information on the CONNECT and ALERTING stages of a call set up is coming from and what its for:

*Jun 16 15:59:38.989: ISDN Se0/0/0:15 Q931: RX <- SETUP pd = 8 callref = 0x0011

Sending Complete

Bearer Capability i = 0x9090A3

Standard = CCITT

Transfer Capability = 3.1kHz Audio

Transfer Mode = Circuit

Transfer Rate = 64 kbit/s

Channel ID i = 0xA18392

Preferred, Channel 18

Progress Ind i = 0x8A81 - Call not end-to-end ISDN, may have in-band info

Calling Party Number i = 0x2183, '703939030'

Plan:ISDN, Type:National

Called Party Number i = 0xC1, '4999'

Plan:ISDN, Type:Subscriber(local)

*Jun 16 15:59:39.109: ISDN Se0/0/0:15 Q931: TX -> CALL_PROC pd = 8 callref = 0x8011

Channel ID i = 0xA98392

Exclusive, Channel 18

*Jun 16 15:59:39.317: ISDN Se0/0/0:15 Q931: TX -> ALERTING pd = 8 callref = 0x8011

Progress Ind i = 0x8088 - In-band info or appropriate now available

User-User i = 0x05, '#', 0x8006000891, 'J', 0x00020201, ' ', 0x110000C71D, 'g', 0x91, 'x', 0xF11D9F17C3020A, '.b', 0x0B0AA001000F01, '@', 0xB50000120880A4000400010100

*Jun 16 15:59:39.361: ISDN Se0/0/0:15 Q931: RX <- STATUS pd = 8 callref = 0x0011

Cause i = 0x82AB7E - Access information discarded

Call State i = 0x07

Display i = '888 TJ[NSTEN EJ AKTIV'

*Jun 16 15:59:39.365: ISDN Se0/0/0:15 Q931: TX -> CONNECT pd = 8 callref = 0x8011

Display i = '4428780'

User-User i = 0x05, '"', 0xC006000891, 'J', 0x0002000A9013, ' ', 0xE10B020000C71D, 'g', 0x91, 'x', 0xF11D9F17C3020A, '.b', 0x0B0900110000C71D, 'g', 0x91, 'x', 0xF11D9F17C3020A, '.b', 0x0B0AA001000F01, '@', 0xB50000120880A4000400010100

*Jun 16 15:59:39.409: ISDN Se0/0/0:15 Q931: RX <- STATUS pd = 8 callref = 0x0011

Cause i = 0x82E328 - Information element not implemented

Call State i = 0x08

*Jun 16 15:59:39.413: ISDN Se0/0/0:15 Q931: RX <- STATUS pd = 8 callref = 0x0011

Cause i = 0x82AB7E - Access information discarded

Call State i = 0x08

Display i = '888 TJ[NSTEN EJ AKTIV'

*Jun 16 15:59:39.417: ISDN Se0/0/0:15 Q931: RX <- CONNECT_ACK pd = 8 callref = 0x00117

As you can see we get a message back from the Swedish Telco telling us that its all discarded.

This is MGCP E1 trunk to a Swedish carrier

Thanks guys!

paolo bevilacqua · ‎06-16-2009

Hi,

Yes the switch complains about the strange stuff but the calls is completed.

If you were to use H.323 you could control which IE are sent to the switch.

But, it seems it makes no difference.

craigneeld · ‎06-16-2009

Thanks for the message but im afraid H323 is not an option. Im concerned about these IE elements, we have upto 40 E1 all configured exactly the same but these paticular links are the only one sending this info. They've both also crashed twice in the last 24 hours which I why I want to get to the bottom of why and by what they are being sent..