Great answer. Finally an explanation that makes sense for the marketing babble about IP Telephony making Moves, Adds, and Changes easier. ;-)
One quesiton though, does CallManager really care about MAC addresses? Unless the receiving phone is on the same network segment as the calling phone, the MAC address won't help matters. ARP would take care of getting the MAC when it's needed. Priscilla Bruce Enders wrote: > > B. J. > The only trick here is to remember that the User phone number > "1111" is > "mapped" to the MAC address and IP address of the ethernet > interface > associated with the hard phone, or the laptop in the case of > Softphone. > (Both are PCs running specific applications software). Whenever > either is > disconnected from the network long enough for link to drop, > they have to > check in with DHCP when they are re-connected to the network. > Both also > have to check in with their CallManager. During that process, > they > identify themselves using their MAC address, and announce their > current > IP address. After that, the CM can simply forward based on the > IP > address. This capability is one of the primary reasons that > Moves, Adds, > and Changes in an IP Telephony system are far more simple than > in a > legacy PBX environment. (The logic behind your response sounds > like it > comes from the legacy telephone world, which is very used to > working in a > very static addressing environment). > Bruce > > B.J. Wilson wrote: > > Hi Vance - > > I too am studying All Things VoIP, and I'm curious how > this would work. > Say you have User A trying to call User B. User B is > currently in the > office. So User A dials '1111' which is User B's phone > number (or "route > pattern" if you want to be specific). CallManager picks up > the route > pattern, looks up User B's location, and forwards the call > on. All is good. > Now, say User B is telecommuting. How does CallManager > know this? How > does your RAS (remote access) server notify CM that User B's > geographical > location has moved? Is there something in User B's RAS > (Registration, > Admission and Status) setup that alerts CM to the fact that > they're dialing > in from home? > > Thanks, > > BJ > > ----- Original Message ----- > From: "Vance Krier" > To: > Sent: Wednesday, October 16, 2002 4:08 AM > Subject: Re: VoIP Clarification. [7:55682] > > Hey Stu, > > In simple terms, yes you are correct. However, as I'm sure > you know, you > need to take this type of setup with a grain of salt. If > you have a > > decent > > bandwidth, low latency, consistent connection between the > phone and CM, it > works fine. There's absolutely no guarantees for QoS on > the Internet. > Now, FWIW, I use softphone on my laptop when I travel and > I've gotten > satisfactory results (IMO) better than 75% of the time. > > I always pitch this as being a *kewl* feature, but never as > a selling > > point. > > I'm > very, very cautious with customers over this. As long as > the user > using it is understanding and realizes there will be times > when it doesn't > work or the quality is really crappy, then typically they > stay happy. Not > something I'd give to Internet/computer/technology > illiterate executive. > > I love it, by the way. > > Good luck, > Vance > > ""Stuart Pittwood"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED] ... > > Good Morning all, > > I am just starting to look into VoIP as I have been asked > by my manager > > to > > do some research and find out if there are any benifits > from VoIP for > > our > > firm. > > Am I right in saying that if we had a solution based on > Cat 6000 (or > similar) switches, with a cisco VPN solution for the home > workers, that > users who use their laptop at home with cisco softphone > or hardware > > phone > > could have their telephone extenstion follow them? > > Please forgive the simplicity of my question, just making > sure I am > > thinking > > along the right lines. > > Thanks > > Stu > -- > > Bruce Enders Email: > [EMAIL PROTECTED] Chesapeake NetCraftsmen > o:(410)-280-6927, c:(443)-994-0678 > 1290 Bay Dale Drive, Suite 312 WWW: > http://www.netcraftsmen.net Arnold, MD 21012-2325 > Cisco CCSI# 96047 > Efax 443-331-0651 > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=55750&t=55682 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
