[Uri-review] 'skype' and 'callto' schemes

[Mykyta Yevstifeyev <[e-mail]>]

Hello,

Skype(tm) is known to use 'skype' and 'callto' URI schemes.  There is no 
any clear specification of the schemes on the Skype site, nor can I find 
it on the Net.  However, the syntax is known; it is said to be 
(transforming into ABNF):

> skype-uri      = "skype:" name [params]
> name           = telephone-subscriber / skype-username
> telephone-subscriber = <as defined in RFC 3966>
> skype-username = ALPHA 5( ALPHA / DIGIT ) *26( ALPHA/DIGIT)
> params         = "?" param
> param          = "add" / "call" / "chat" / "sendfile"
>                / "userinfo" / ext-param
> ext-param      = 1*ALPHA
>
> callto-uri     = "callto:" name

The operations of 'callto' URIs are to open a Skype call to <name>; 
'skype' URI provide richer semantics, per <params>.  Documentation for 
Skype operations is available from 
share.skype.com/media/1.2_api_doc_en.pdf (this document says it is 
confidential ;-).

The 'skype' URIs are known to be widely used; 'callto' are also used, 
but not as often as 'skype'.  Currently, the schemes are not officially 
registered with IANA; so my questions is: Can (should?) an effort to 
specify these two schemes be undertaken?  Any thoughts are welcome.

Mykyta Yevstifeyev