The absence of any current registrations, and the absence of INVITE
responses - that's all there is within the scope of SIP as far as I know.
There are no <<here I am, I'm up>> messages specified for the phone itself.
Maybe I don't understand your question, but you _have_ to try sending
messages to see if a SIP phone is on the net. Hopefully, all SIP phones
support PING. Some may support SNMP.
Barry Desborough
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: 22 May 2001 12:47
To: Barry Desborough
Cc: [EMAIL PROTECTED]
Subject: RE: [Sip-implementors] plug/unplug SIP phone ??
Quoting Barry Desborough <[EMAIL PROTECTED]>:
> If you're concerned about a SIP phone being unplugged with a call up,
> you
> can send periodic INVITEs for the current call leg and check for
> responses.
> Also, you could also check for ICMP destination/port unreachable
> messages
> for signaling and media.
>
> Barry Desborough
OK, but we are not notified that a SIP phone is unplugged when no call is
up.
To Check ICMP messages I have to send messages. What if no messages are sent
?
Does it mean that there no offcial mechanism to check plug/unplug state of a
SIP
phone?
patrick
_______________________________________________
Sip-implementors mailing list
[EMAIL PROTECTED]
http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
