CNet News reported yesterday that broadband subscribers attached to various cable providers were experiencing problems with some VoIP calls being blocked. The article points out that some "angry customers" atributed the problem to overzealous cable companies trying to bolster their own VoIP offerings. Reading the rest of the article it's clear that this probably relates back to filters these cable providers put in place to mitigate the MSBlaster worm. It seems that several of the affected VoIP services use port 69 (normally TFTP) for call setup rather than port 5060. Filtering (blocking) port 69 through your Internet Firewall is totally normally. I'd suggest keeping track, but not filtering port 5060.
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