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Cisco Bug: CSCuq47742 - CUBE not opening random UDP ports for SIP.

Last Modified

Feb 26, 2020

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

Incoming or outgoing calls over SIP UDP don't work.

Outgoing calls don't send the INVITE.

Incoming calls, CUBE does not respond to INVITE.

You never see UDP random port being open on the CUBE with the debug ip udp.


IOS version  c3900-universalk9-mz.SPA.152-4.M3

Related Community Discussions

CUCM Calls to ITSP via CUBE
Hi - We are setting up a CUBE with CUCM connected to our ITSP.  Inbound calls are working fine, however we are receiving a SIP 503 for outbound calls as below: Sent: SIP/2.0 503 Service Unavailable Via: SIP/2.0/TCP;branch=z9hG4bK40fc99b489d From: "Test Phone" <sip:ipphone@CUCMIP>;tag=28458~cf036381-34e6-41aa-bacf-018                                                                                        3204bae3d-40019195 To: <sip:testnumber@CUBE_LAN_IP>;tag=1AADF722-170E Date: Tue, ...
Latest activity: Apr 22, 2015
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