MUST be quoted string as the ABNF definition in RFC 3261 for
Proxy-Authenticate because it may take several options for the client.

qop-options         =  "qop" EQUAL LDQUOT qop-value
                       *("," qop-value) RDQUOT
qop-value           =  "auth" / "auth-int" / token

// In 407
Proxy-Authenticate  =  "Proxy-Authenticate" HCOLON challenge
challenge           =  ("Digest" LWS digest-cln *(COMMA digest-cln))
                       / other-challenge
other-challenge     =  auth-scheme LWS auth-param
                       *(COMMA auth-param)
digest-cln          =  realm / domain / nonce
                        / opaque / stale / algorithm
                        / qop-options / auth-param


> -----Original Message-----
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf 
> Of [EMAIL PROTECTED]
> Sent: 2006年2月7日 18:41
> To: [email protected]
> Subject: [Sip-implementors] Regarding the qop parameter in 
> response to the 407 Proxy Authentication.
> 
> 
> 
> Hi,
> 
> In reply  to the SIP/2.0 407 Proxy Authentication
> required What should be the state of paramater qop=auth-int 
> contained in the response , whether it should be in quotes or 
> without quotes. Could you please tell me about this.
> 
> Thanks and Regards
> Bhanuprakash Singh
> 
> 
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