On Nov 7, 2008, at 7:48 AM, Alexander Lopez wrote: > Would a system such as SPF or DomainKeys work for Voip calls. > > It is beneficial to have your SIP PBX accept guest calls but it > would be > nice if those guest calls could be validated somehow as a legitimate > call without having to use something like Zapateller oops I mean, > Dahadi-teller???
It would be possible right now to create a filter mechanism that would allow you to whitelist/blacklist callers based on "Caller ID" in the From: header, using existing DNS tools with probably very few downsides. It's like SPF (or RPF, if you're a router geek) in some ways, but uses SRV records or A records to determine if the call is 'valid' as an origin. It doesn't talk at all about creating the whitelist/blacklist, only about how you verify that the From: header (or other header) is originating from an IP address that is authorized to send it. Check out this proposal I did a while ago: https://mail.internet2.edu/wws/arc/sip.edu/2006-07/msg00012.html and a version of the Asterisk AGI script that's a little less mangled: http://forum.e164.org/index.php?topic=16.0 JT --- John Todd [EMAIL PROTECTED] +1-256-428-6083 Asterisk Open Source Community Director _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-biz mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-biz
