[asterisk-dev] "sip:" or "SIP:" in chan_sip

[Olle E Johansson]

16 maj 2007 kl. 11.18 skrev Steve Langstaff:

> Assuming Asterisk 'complies' to RFC 3261, the BNF in that document  
> says:
>
>    From        =  ( "From" / "f" ) HCOLON from-spec
>    from-spec   =  ( name-addr / addr-spec )
>                   *( SEMI from-param )
>    addr-spec   =  SIP-URI / SIPS-URI / absoluteURI
>    SIP-URI     =  "sip:" [ userinfo ] hostport
>                        uri-parameters [ headers ]
>
> RFC2243 "Augmented BNF for Syntax Specifications: ABNF" says:
>
>    ABNF permits specifying literal text string directly, enclosed in
>    quotation-marks.
> ...
>         NOTE:     ABNF strings are case-insensitive and
>                   the character set for these strings is us-ascii.
>

Ok, so that means that all headers are case-insensitive?

FROm: "Olle Johansson" <SiP:oej at eXample.cOm>
froM: "Olle Johansson" <sip:oej at EXAMPLE.com>

are the same?

/O

>
>> -----Original Message-----
>> From: asterisk-dev-bounces at lists.digium.com
>> [mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of
>> Tony Mountifield
>> Sent: 16 May 2007 09:45
>> To: asterisk-dev at lists.digium.com
>> Subject: [asterisk-dev] "sip:" or "SIP:" in chan_sip
>>
>> Recently I came across someone trying to interface their own
>> Asterisk PBX to a non-Asterisk SIP interface run by one of
>> our clients.
>>
>> They could successfully register with Asterisk to the
>> client's system, and could originate calls from Asterisk. But
>> when making calls via the client's system to their Asterisk
>> box, they got the following errors:
>>
>> May 13 23:35:15 NOTICE[1437]: chan_sip.c:7178
>> check_user_full: From address missing 'sip:', using it anyway
>> May 13 23:35:15 WARNING[1437]: chan_sip.c:6713
>> get_destination: Huh? Not a SIP header
>> (SIP:9732xxxx at sip.xxxxxxx.com:5060)?
>>
>> When I looked at the relevant parts of chan_sip, it became
>> obvious to me that the client's system was sending SIP URLs
>> beginning with "SIP:" instead of "sip:", but chan_sip in
>> various places does strncmp(url,"sip:",4).
>>
>> Is "SIP:" valid? If so, I think there are many places where
>> strncasecmp() should be used instead.
>>
>> I checked trunk, and noticed that strncasecmp() is used
>> sometimes, but that strncmp is also still used in some
>> places. It also affects 1.4 and 1.2.
>>
>> Comments?
>>
>> Cheers
>> Tony
>> --
>> Tony Mountifield
>> Work: tony at softins.co.uk - http://www.softins.co.uk
>> Play: tony at mountifield.org - http://tony.mountifield.org
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---
Olle E. Johansson * Asterisk Evangelist, developer * VOOP A/S
olle at voop.com