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<p class=MsoNormal>We are seeing random call drops on calls made from an CUCM
site via the PSTN to another site where the phones are connected to a Siemens
PABX. The CUCM is 6.1.1-200-3 and the calls are being made via a 3845 –
h323 gateway connected to an E1 telco service with switchtype primary-net5. The
random call drops have not been reported to any other external numbers
which go via the same E1, only to this specific site with the Siemens Pabx. The
problem may also have started when the CUCM phone system was reconfigured to
append a carrier access code to external numbers to swap the service provider
for cheaper rates. We are currently seeing if sending calls via the default
carrier fixes the issue. I managed to capture a debug isdn q931 of a call dropping.
The Cisco gateway is receiving the following disconnect code: “ Cause
i = 0x80FF - Interworking error; unspecified”. Looking up the cause code –
the point of origin 0x80 means that this was from the router, why would the
router receive a disconnect from itself? <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>464020: Jan 6 13:15:12.130 WST: ISDN Se0/0/0:15 Q931:
TX -> SETUP pd = 8 callref = 0x415B<o:p></o:p></p>
<p class=MsoNormal> Sending Complete<o:p></o:p></p>
<p class=MsoNormal> Bearer Capability
i = 0x8090A3<o:p></o:p></p>
<p class=MsoNormal>
Standard = CCITT<o:p></o:p></p>
<p class=MsoNormal>
Transfer Capability = Speech<o:p></o:p></p>
<p class=MsoNormal>
Transfer Mode = Circuit<o:p></o:p></p>
<p class=MsoNormal>
Transfer Rate = 64 kbit/s<o:p></o:p></p>
<p class=MsoNormal> Channel ID i =
0xA98387<o:p></o:p></p>
<p class=MsoNormal>
Exclusive, Channel 7<o:p></o:p></p>
<p class=MsoNormal> Calling Party
Number i = 0x0081, '35525'<o:p></o:p></p>
<p class=MsoNormal>
Plan:Unknown, Type:Unknown<o:p></o:p></p>
<p class=MsoNormal> Called Party
Number i = 0x80, '18875093114171'<o:p></o:p></p>
<p class=MsoNormal>
Plan:Unknown, Type:Unknown<o:p></o:p></p>
<p class=MsoNormal>464021: Jan 6 13:15:12.214 WST: ISDN Se0/0/0:15 Q931:
RX <- CALL_PROC pd = 8 callref = 0xC15B<o:p></o:p></p>
<p class=MsoNormal> Channel ID i =
0xA98387<o:p></o:p></p>
<p class=MsoNormal>
Exclusive, Channel 7<o:p></o:p></p>
<p class=MsoNormal>464022: Jan 6 13:15:13.974 WST: ISDN Se0/0/0:15 Q931:
RX <- ALERTING pd = 8 callref = 0xC15B<o:p></o:p></p>
<p class=MsoNormal> Progress Ind i =
0x8488 - In-band info or appropriate now available<o:p></o:p></p>
<p class=MsoNormal> Progress Ind i =
0x8082 - Destination address is non-ISDN<o:p></o:p></p>
<p class=MsoNormal>464025: Jan 6 13:15:19.114 WST: ISDN Se0/0/0:15 Q931:
TX -> ALERTING pd = 8 callref = 0xB0D2<o:p></o:p></p>
<p class=MsoNormal> Progress Ind i =
0x8188 - In-band info or appropriate now available<o:p></o:p></p>
<p class=MsoNormal>464026: Jan 6 13:15:22.830 WST: ISDN Se0/0/0:15 Q931:
RX <- CONNECT pd = 8 callref = 0xC15B<o:p></o:p></p>
<p class=MsoNormal>464027: Jan 6 13:15:22.834 WST: %ISDN-6-CONNECT:
Interface Serial0/0/0:6 is now connected to 18875093114171 N/A<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>464028: Jan 6 13:15:22.834 WST: ISDN Se0/0/0:15 Q931:
TX -> CONNECT_ACK pd = 8 callref = 0x415B<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>464063: Jan 6 13:16:34.953 WST: ISDN Se0/0/0:15 Q931:
RX <- DISCONNECT pd = 8 callref = 0xC15B<o:p></o:p></p>
<p class=MsoNormal> Cause i = 0x80FF
- Interworking error; unspecified<o:p></o:p></p>
<p class=MsoNormal>464065: Jan 6 13:16:34.953 WST: %ISDN-6-DISCONNECT:
Interface Serial0/0/0:6 disconnected from 18875093114171 , call lasted 72
seconds<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>464066: Jan 6 13:16:34.953 WST: ISDN Se0/0/0:15 Q931:
TX -> RELEASE pd = 8 callref = 0x415B<o:p></o:p></p>
<p class=MsoNormal>464067: Jan 6 13:16:34.973 WST: ISDN Se0/0/0:15 Q931:
RX <- RELEASE_COMP pd = 8 callref = 0xC15B<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Regards,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b><span style='font-size:11.5pt;font-family:"Helvetica","sans-serif";
color:black'>Wil <o:p></o:p></span></b></p>
<p class=MsoNormal><o:p> </o:p></p>
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