Re: Fault tolerance

Regarding the UAS hearbeat signals, the user agent
actually keeps communicating with the SIP server by
means sending "REGISTER" messages and keeps renewing
the registration. Some user agents actially provide a
configuration option to set how often this
registration renewal communication needs to take
place. Does it make any sence in your scenario?
Regards,

Lakmal




--- James Wu <[email protected]> wrote:

> Thanks to both of you. Our primary concern is
> identifying when a network 
> interruption might have caused a remote UAS to close
> the port, and 
> therefore require the UA to re-initiate
> communications. Both our 
> Vocal-based UA and the UAS with which it
> communicates (Versatel IQ) 
> implemented VAD, so it is not as simple as
> monitoring RTP packets (as 
> VAD may result in prolonged periods of silence). To
> my knowledge, the 
> UAS does not emit a heartbeat. Thanks again for any
> further suggestions!
> 
> James
> 
> Mariano-Julio Stokle wrote:
> 
> > There are also some networking hardware
> (application switches) that 
> > can balance SIP sessions between different SIP
> servers.
> >
> > Mariano Stokle
> >
> >  
> >
> >
> >
> > -----Original Message-----
> > From: [email protected]
> [mailto:[email protected]]
> > Sent: Thursday, January 27, 2005 8:22 AM
> > To: James Wu; Vocal Mailing List
> > Subject: [Vocal] Re: Fault tolerance
> >
> >
> > Hi James,
> >
> > If you are thinking of failovers and load
> balancing,
> > this has to be implemented using DNS SRV records
> and
> > has to be implemented on client as well as server.
> I'm
> > not so sure about the last part.
> >
> > Regards,
> >
> > Lakmal
> >
> >
> >
> > --- James Wu <[email protected]> wrote:
> >
> > > Hello everyone,
> > >   Can anyone tell me how to deal with fault
> > > tolerance in a Vocal-based
> > > UA? For example, if a network failure occured,
> and
> > > the remote system
> > > timed out and hungup during the outage, how
> could a
> > > Vocal-based (Vocal
> > > 1.4b) UA find out about it? Thanks!
> > >
> > > James
> > >
> > >
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> > >
> >
> >
> >
> >                
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