Use iChat A/V features with NAT routers that bind SIP

Oct 26, '04 10:26:00AM

Contributed by: Anonymous

This is a broader version of a previous hint (Use iChatAV with Speedtouch 510 ADSL modems) about removing the SIP binding from the NAT settings, which will enable iChat's audio and video conferencing features.

This issue also occurs with a lot more routers, not just the SpeedTouch series -- like some (but not all) ZyXel Prestige models. The problem does not always occur, but a sign of this problem is that iChat does not allow the user to set up an audio of video conference. Instead it will list the user as "Busy in another conference" when you try to connect.

Instead of modifying your modem's settings, here's a potentially easier fix. Simply tell iChat to connect using port 80 in its Preferences. Open iChat -> Preferences, click on Accounts, then click on Server Options. Take note, the Server Options button is only enabled when you are not connected to the iChat servers). After changing this setting, iChat will circumvent the SIP binding problems, and audio/video chats should now be possible.

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