I'm running an old Cisco 1751-V for years now as ISDN-SIP-Gateway. Deutsche Telekom is getting rid of ISDN more and more and lately, ISDN-VoIP config is no longer necessary on my side. Since the router handles additional duties, I deconfigured the ISDN- and VoIP-stuff with the appropriate no-command forms.

I can't do that on voice-port configurations, though:

voipgw(config)#no voice-port 0/0
% Cannot remove voice-ports this way

Q: How am I supposed to remove voice-ports?

Searching the net for the error message yields no really helpful advice. One source states that one has to remove the appropriate hardware but since I deconfigured and shut the appropriate BRI-Interfaces, I think this is not a solution applicable to remote managed devices.


voice-port refers to physical hardware, so you can't "no" it away. It has to be physically removed from the router -- if possible, or simply shut it down.

  • After erasing the startup configuration and display of running-config, the ports indeed are still existing but there's no (visible) configuration for these, now.
    – PoC
    Sep 12 '19 at 11:25

voice-port 0/0 enters the configuration context for that port. show voice port summary should show you what you can do there.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.