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# SIP - Session Initiation Protocol - Internet telephony - RFC 3261, 3265, etc.
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# Pattern attributes: good fast fast
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# Protocol groups: voip ietf_proposed_standard
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# Wiki: http://www.protocolinfo.org/wiki/SIP
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# Copyright (C) 2008 Matthew Strait, Ethan Sommer; See ../LICENSE
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#
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# This pattern has been tested with the Ubiquity SIP user agent and has been
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# confirmed by at least one other user.
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#
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# Thanks to Ankit Desai for this pattern. Updated by tehseen sagar.
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#
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# SIP typically uses port 5060.
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#
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# This pattern is based on SIP request format as per RFC 3261. I'm not
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# sure about the version part. The RFC doesn't say anything about it, so
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# I have allowed version ranging from 0.x to 2.x.
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#Request-Line = Method SP Request-URI SP SIP-Version CRLF
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sip
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^(invite|register|cancel|message|subscribe|notify) sip[\x09-\x0d -~]*sip/[0-2]\.[0-9]
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