[Sip] Reg. refresher param in 2xx response

[Harbhanu <[e-mail]>]

As per 4028, for the following case UAS MUST specify the refresher parameter
in 2xx response.

 

UAC ----INV ----> supported=timer, SE=90-----> UAS

 

UAC <----2XX INV -- SE=90- ---------------- UAS

 

[Section-9, page-16]

The UAS MUST set the value of the refresher parameter in the Session-Expires
header field in the 2xx response.
 

But IMO when UE sends response for INVITE and it adds Session-Expires but
doesn't specify the refresher parameter.

Then in this case UAC can safely assume that, either the UAS doesn't support
session-timer or it doesn't want to act as a 'refresher'.

 

So instead of sending a BYE UAC MAY treat this as a buggy/naive UE & hence
"UAC" SHOULD act as 'refresher'.

 

Please share your opinion. Thanks!

 

Regards,

Harbhanu

 

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