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Journal of jbodoni (3320)

Wednesday September 15, 2004
09:15 PM

cisco softphone: one-way audio via vpn

[ #20900 ]

I couldn't find this documented anywhere else, so it goes here! By golly, you can find ALL KINDS of solutions here at - some that might even have to do with Perl!!

keywords: cisco softphone audio firewall vpn nat

If you have one-way audio (specifically, they can hear you on your softphone but you can't hear them), check the following:

Settings -> Audio -> Network Audio Settings

The top group of radio buttons has three settings:

  • Automatic Selection (with an update button that didn't work for me)
  • Select Address (a dropdown menu with two IP addresses)
  • Specify Address

On my laptop, the second button was selected (which was correct), but my wireless router's NAT IP address was chosen. Once I selected the address provided by the VPN concentrator, all was well.

I found information on Cisco's site that referenced having to open UDP ports 16384 through 32767 inclusive (HELLO!), other stuff elsewhere saying that I should change my router's config to put my laptop in the DMZ, blah blah blah. All unnecessary.

Perl Content:

I'm working with a gent from Colorado on a script that helps Novell BorderManager admins have an easier time of dealing with access control lists. He's got the code working, I'm doing a little polishing and PODding.

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