Problem Description
Requirement / Issue:
Service Provider is using ISR 3945 as a Cisco Unified Border Element (CUBE) to connect to his Interconnects over SIP trunks. It is unclear what causes the condition when a call disconnects on one side but does not get cleared on the other side, and results in Call hanging/Call hung.
However, it does happen sometimes and causes hanging calls on CUBE. ISP will be requesting their partner Service Provider to identify and clear the hung state calls to avoid blocking of connections and these can be cleared manually in CUBE as shown here.
Solution
Show commands to Identify the active calls:
Show commands
SBC02#sh call active voice summary
Telephony call-legs: 0
SIP call-legs: 4
H323 call-legs: 0
Call agent controlled call-legs: 0
SCCP call-legs: 0
Multicast call-legs: 0
Total call-legs: 4 SBC02#sh rtp call
No. CallId dstCallId LocalRTP RmtRTP LocalIP RemoteIP 1 138 139 17110 16400 10.22.0.113 200.0.2.254 callId 138 (dir=1): called=2126315001 calling=2009 redirect= dest callId 139: called=2126315001 calling=2009 redirect= 1 context C0B89140 xmitFunc 6369789C 2 139 138 17582 16428 10.22.0.113 20.1.1.22 callId 139 (dir=2): called=2126315001 calling=2009 redirect= dest callId 138: called=2126315001 calling=2009 redirect= 1 context 68F85540 xmitFunc 6369789C 3 140 141 16514 16430 10.22.0.113 20.1.1.22 1 context 68F5CF00 xmitFunc 6369789C 4 141 140 16432 16402 10.22.0.113 200.0.2.254 1 context 68F61DC0 xmitFunc 6369789C
Found 4 active RTP connections
SBC02#show sip calls
SIP UAC CALL INFO
Call 1 SIP Call ID : BD56F427-1A5311DE-80C2D220-A86CA6FD@10.21.0.113 State of the call : STATE_ACTIVE (7) Substate of the call : SUBSTATE_NONE (0) Calling Number : 26316001 Called Number : 2126315001 Bit Flags : 0xC04018 0x300 0x80080 CC Call ID : 139 Source IP Address (Sig ): 10.21.0.113 Destn SIP Req Addr:Port : [20.1.1.1]:5060 Destn SIP Resp Addr:Port: [20.1.1.1]:5060 Destination Name : 20.1.1.1 Number of Media Streams : 2 Number of Active Streams: 2 RTP Fork Object : 0x0 Media Mode : flow-through Media Stream 1 State of the stream : STREAM_ACTIVE Stream Call ID : 139 Stream Type : voice+dtmf (1) Stream Media Addr Type : 1 Negotiated Codec : Passthrough (0 bytes) Codec Payload Type : 255 (None) Negotiated Dtmf-relay : inband-voice Dtmf-relay Payload Type : 0 Media Source IP Addr:Port: [10.22.0.113]:17582 Media Dest IP Addr:Port : [20.1.1.22]:16428 Media Stream 2 State of the stream : STREAM_ACTIVE Stream Call ID : 140 Stream Type : voice+dtmf (1) Stream Media Addr Type : 1 Negotiated Codec : Passthrough (0 bytes) Codec Payload Type : 255 (None) Negotiated Dtmf-relay : inband-voice Dtmf-relay Payload Type : 0 Media Source IP Addr:Port: [10.22.0.113]:16514 Media Dest IP Addr:Port : [20.1.1.22]:16430
Options-Ping ENABLED:NO ACTIVE:NO Number of SIP User Agent Client(UAC) calls: 1
SIP UAS CALL INFO
Call 1 SIP Call ID : 622C6BFA-1@200.0.2.254 State of the call : STATE_ACTIVE (7) Substate of the call : SUBSTATE_NONE (0) Calling Number : 2009 Called Number : 2126315001 Bit Flags : 0xC0401E 0x300 0x80004 CC Call ID : 138 Source IP Address (Sig ): 10.21.0.113 Destn SIP Req Addr:Port : [200.0.2.254]:5063 Destn SIP Resp Addr:Port: [200.0.2.254]:1261 Destination Name : 200.0.2.254 Number of Media Streams : 2 Number of Active Streams: 2 RTP Fork Object : 0x0 Media Mode : flow-through Media Stream 1 State of the stream : STREAM_ACTIVE Stream Call ID : 138 Stream Type : voice+dtmf (1) Stream Media Addr Type : 1 Negotiated Codec : Passthrough (0 bytes) Codec Payload Type : 255 (None) Negotiated Dtmf-relay : inband-voice Dtmf-relay Payload Type : 0 Media Source IP Addr:Port: [10.22.0.113]:17110 Media Dest IP Addr:Port : [200.0.2.254]:16400 Media Stream 2 State of the stream : STREAM_ACTIVE Stream Call ID : 141 Stream Type : voice+dtmf (1) Stream Media Addr Type : 1 Negotiated Codec : Passthrough (0 bytes) Codec Payload Type : 255 (None) Negotiated Dtmf-relay : inband-voice Dtmf-relay Payload Type : 0 Media Source IP Addr:Port: [10.22.0.113]:16432 Media Dest IP Addr:Port : [200.0.2.254]:16402
Options-Ping ENABLED:NO ACTIVE:NO Number of SIP User Agent Server(UAS) calls: 1
Use the "called" number from the show commands given and use the "clear call voice" command to clear the hung calls towards the ISP network with the Call ID and Cause Code Value of the hung call:
Clear Call Voice command: To clear one or more voice calls detected as inactive because there is no RTP or RTCP activity, use the clear call voice command in EXEC or privileged EXEC mode.
For the above example execute this command and use the "Called-number" field to clear the hung calls with the Called Number : 2126315001
SBC02#clear call voice causecode 17 called-number 2126315001
This is how you can clear the hung inactive voice calls on Cisco Unified Border Element (CUBE).
More Example:
The following example clears inactive voice calls with the cause code ID of 112B:
SBC02# clear call voice causecode 1 id 112B |
