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RFC 4028, "Session Timers in the Session Initiation Protocol (SIP)", April 2005

Source of RFC: sip (rai)

Errata ID: 4056
Status: Reported
Type: Editorial

Reported By: Lucas Wang
Date Reported: 2014-07-17

Section 8 says:

8.  Proxy Behavior

   Session timers are mostly of interest to call stateful proxy servers
   (that is, to servers that maintain the state of calls and dialogs
   established through them).  However, a stateful proxy server (that
   is, a server which is aware of transaction state but does not retain
   call or dialog state) MAY also follow the rules described here.
   Stateless proxies MUST NOT attempt to request session timers.
   Proxies that ask for session timers SHOULD record-route, as they
   won't receive refreshes if they don't.

It should say:

   Session timers are mostly of interest to call stateful proxy servers
   (that is, to servers that maintain the state of calls and dialogs
   established through them).  However, a stateless proxy server (that
   is, a server which is aware of transaction state but does not retain
   call or dialog state) MAY also follow the rules described here.
   Stateless proxies MUST NOT attempt to request session timers.
   Proxies that ask for session timers SHOULD record-route, as they
   won't receive refreshes if they don't.

Notes:

After the "However", it should be a stateless proxy server.

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