ISP This topic has 0 replies, 1 voice, and was last updated 22 years, 1 month ago by Axel. Viewing 1 post (of 1 total) Author Posts 5th December 2002 at 00:43 #22683 AxelGuest How do i configure the Cisco router 2011 to use a differnt tcp port for a VoIP circuit or how can i do VoIP without the knoledge of my ISP? I need to use a different VoIP TCP port because My ISP can block my circuit. Author Posts Viewing 1 post (of 1 total) The forum ‘Voice over IP’ is closed to new topics and replies.