[asterisk-bugs] [JIRA] (ASTERISK-21845) after reach maxcalls (defined in sip.conf), Asterisk sends out 480 and also BYE

[Tony Ching (JIRA)]

Tony Ching created ASTERISK-21845:
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             Summary: after reach maxcalls (defined in sip.conf), Asterisk sends out 480 and also BYE
                 Key: ASTERISK-21845
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21845
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_sip/General
    Affects Versions: 1.8.22.0
         Environment: CentOS 5.5 64-bits
            Reporter: Tony Ching
            Severity: Minor


maxcalls in asterisk.conf was set to limit the number of handling sip call.

The bug is : Asterisk sends 480 Temporarily Unavailable to the incoming sip call, after reaching the number of maxcalls (which is ok). The SIP client sends ACK (this is normal). Then, Asterisk sends a BYE (which is not correct).

== pcap =======
Time abs Source Destination Protocol Length Info
0.0 192.168.3.79 192.168.3.217 SIP/SDP 824 Request: INVITE sip:513 at 192.168.3.217:6061, with session description
0.0 192.168.3.217 192.168.3.79 SIP 544 Status: 100 Trying
0.0 192.168.3.217 192.168.3.79 SIP 537 Status: 480 Temporarily Unavailable
0.0 192.168.3.79 192.168.3.217 SIP 354 Request: ACK sip:513 at 192.168.3.217:6061
0.0 192.168.3.217 192.168.3.79 SIP 464 Request: BYE sip:1234567 at 192.168.3.79:6763
0.0 192.168.3.79 192.168.3.217 SIP 361 Status: 481 Call/Transaction Does Not Exist

== ast debug output =======

Maximum call limit of 1 calls exceeded by 'SIP/sip_incoming-00000002'!
Failed to start PBX (call limit reached)
Trying to put 'SIP/2.0 480' onto UDP socket destined for 192.168.3.79:6763
Hanging up channel 'SIP/sip_incoming-00000002'
Hangup call SIP/sip_incoming-00000002, SIP callid 954837550a18de12 at YWxleGNoYW4tcGM.
Setting RTCP address on RTP instance '0x10bfe478'
No provider found, checking channel drivers for SIP - sip_incoming
Checking device state for peer sip_incoming
Changing state for SIP/sip_incoming - state 1 (Not in use)
device 'SIP/sip_incoming' state '1'
No provider found, checking channel drivers for SIP - sip_incoming
Checking device state for peer sip_incoming
Changing state for SIP/sip_incoming - state 1 (Not in use)
device 'SIP/sip_incoming' state '1'
Setting the marker bit due to a source update
Setting the marker bit due to a source update
Setting the marker bit due to a source update
**** Received ACK (devil) - Command in SIP ACK
Stopping retransmission on '954837550a18de12 at YWxleGNoYW4tcGM.' of Response 1: Match Found
Trying to put 'BYE sip:852' onto UDP socket destined for 192.168.3.79:6763

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