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
--
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1290 Bay Dale Drive, Suite 312 WWW: http://www.netcraftsmen.net
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Message Posted at:
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