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Cisco Bug: CSCuq27883 - CME: Make 'no-reg' def. behavior to stop automatic registration attempt

Last Modified

Sep 14, 2019

Products (95)

  • Cisco IOS
  • Cisco 1905 Serial Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 812 CiFi Integrated Services Router
  • Cisco 881SRSTW Integrated Services Router
  • Cisco 898 Secure G.SHDSL EFM/ATM with Multi-Mode 4G LTE ISR Router
  • Cisco C892FSP Integrated Services Router
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Known Affected Releases

15.3(1)T 15.4(3)M

Description (partial)

SCCP Survivable Remote Site Telephony (SRST) or Cisco Unified Communications Manager Express (CUCME) phones/endpoints, by default, attempt to register with the SIP trunk service provider. 

This may cause interoperability issues with certain providers that don't ignore the registration attempts and increases the number of SIP messages sent to the provider.

This is seen when CUCME is defined and there is a SIP trunk in use for PSTN connectivity. It can also be seen when SRST is defined on a CUBE with a SIP trunk for PSTN connectivity. 

There also needs to be SIP trunk registration enabled under the 'sip-ua' sub-command mode. 

credentials username <username> password <password> realm <realm>
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