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Force iChat's multi-person bandwidth allowance
Authored by: Onirix on May 11, '06 11:29:18AM

Just been using this method to troubleshoot a satellite connection problem with ichat, and I thought I would mark our findings here, and answer some questions as well.

The firewall you set up to block the bandwidth check and to default to quicktime streaming speed is only temporary, so restarting your machine sets it back normal in my experience.

Regarding actual bandwidth check at start, indeed this hint is good and does set the bandwidth to quicktime streaming settings, but our problem with connectivity had to do with a second test that ichat does as soon as a videochat tries to start. It seems it checks again, between users involved in the chat, and this does not use the same bandwidth check method I guess.

Our problem is over satellite in the north our speed starts very low, then bursts to high enough for a chat. Ichat always reads that we have insufficient (28 up and down!) bandwidth to start the chat, even when using this hint. But we tricked it once by starting a file transfer right before the chat, thus upping our speed. iChat then knew we had enough and permitted it.

Anyone out there know of a way to get ichat never to check bandwidth, or to at least wait until well into the chat before it adjusts? Are there any other discussions out there on this specific satellite problem? Thanks in advance.



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Force iChat's multi-person bandwidth allowance
Authored by: andyinindy on May 18, '06 10:27:31AM
Onirix:

You might find this to be interesting:

http://www.ralphjohnsuk.dsl.pipex.com/page3.html

Specifically, this passage:

Port 5678 is not clearly documented as to it's use in the Apple Doc. It is in fact a server called "snatmap". This server does one job during Audio and Video chat invites. When you send an invite, this server does the negotiating between the two computers and tells them which ports are available for use. As soon as you click on the invite window to make a choice of Accepting, Blocking or Text chatting it immeadiately hands over to Port 5060.

Maybe completely blocking port 5678 would help with your problem?

--andyinindy

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