Thanks very much, everyone. I'll setup a test and prove the vendor to be right/wrong.
Josh On Tue, Apr 12, 2011 at 11:53, Randell Jesup <[email protected]> wrote: > >________________________________________ > >From: [email protected] [ > [email protected]] On Behalf Of Josh Roberts > [[email protected]] > > > >I'm trying to authenticate a statement by a voip/sip system integrator > that > >dhcp has stability and reliability issues because when the phone rings > >(every time, according to this company) it has to check its lease for > >renewal and potentially renew the lease before the call can connect. > >_______________________________________________ > [snip] > >DHCP does *not* have stability and reliability issues in an environment > that implements DHCP > >well -- that has coordinated, redundant DHCP servers, which almost every > IP network does. > >DHCP is used in this manner by many, many enterprises, many of which have > hundreds or thousands > >of IP phones. > > > >There may be certain specialized environments where using DHCP for VoIP > phones is not a good idea, > >but you need to have someone explain exactly why. > > The only case I can think of would be that an IP address change from the > DHCP provider (think DSL) would cause existing RTP streams (and SIP > registrations) to be invalid. A *good* implementation will re-REGISTER > on IP change, and if there's a change during a call it can re-REGISTER, > re-STUN/etc, and then re-INVITE with the new c= value. Note that most > probably don't do the latter, and some may not do the former. This may > be the reason, but it has nothing to do with ringing. > > They may be thinking of a device that's silent for long periods and > might face a router/DHCP-server reboot, or they may have seen equipment > that doesn't renew DHCP correctly. (Grasping at straws here - ask them) > > -- > Randell Jesup, Worldgate (developers of the Ojo videophone) > [email protected] > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
