From: wilfred d'souza (wilfred_thegr8@yahoo.co.in)
Date: Thu Nov 30 2006 - 03:21:06 ART
Hey Andy,
You can try using ip nat skinny tcp port number in the router and check it out. Let me know if that works.
Thanks,
Wilfred
"Haas, Brad" <bhaas@netinfosys.com> wrote:
Check your call manager groups... The phones use tftp (option
150) to download the image and config. Once this is completed the phones
will look at the CCM group settings to decide the ip to use to connect
to call manager. The order you have your tftp servers configured in
DHCP scope is irrelevant to the phone to CCM signaling. You may end up
needing to create a new CCM group and put the outside phones into a
Device pool that uses it...
HTH
-Brad
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Brad Ellis
Sent: Wednesday, November 29, 2006 12:51 PM
To: Andi Bennett; ccielab@groupstudy.com
Subject: Re: OT - CallManager and NAT
Andi,
Check your URLs configured in the call manager. do you have IP
addresses in
there instead of the dns name of the CCM? Im going to assume that since
the
phones are downloading the images already, the option 150 of your DHCP
is
set correctly. i'd bet the CCM is handing out a url of the inside
address
of itself to the phone. make sure the box you are using for dns
resolution
can resolve the callmanager based on the name and update the urls in ccm
accordingly. give that a whack. (at least that's what I would look
into
next if you already havent)
thanks,
Brad Ellis
CCIE#5796 (R&S / Security)
CCSI#30482
Network Learning Inc - A Cisco Sponsored Organization (SO)
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----- Original Message -----
From: "Andi Bennett"
To:
Sent: Wednesday, November 29, 2006 8:50 AM
Subject: OT - CallManager and NAT
Sorry for the off topic here but this has me a bit stumped.
I have Cisco IP
Phones on the "outside " of the network connecting to a CM on the
"inside"
of
the network.
Now, the phones can alternate TFTP to the CM, they then get an
image, but they the try and connect to the real addresses of the CM's,
which
is obviously unroutable on the outside.
I have
ip nat outisde source static
configured to get the phones to the CM. I think the problem is that the
return TFTP image has the embedded real addresses of the CM in it.
as a run
down of config I have
ip nat outside source static 10.18.192.10 172.27.10.1
(Publisher + TFTP server)
ip nat outside source static 10.18.192.11
172.27.10.2 (CM1)
ip nat outside source static 10.18.192.12 172.27.10.3 (CM2)
The phones get the image, then keep trying to connect tot he 10.18.192.x
addresses
I've looked at using the ip nat service port sccp command, but it
seems to have no effect as the phones still try to connect to the real
CM
addresses, not my staic NAT entries.
Is what I'm trying to do possible, or am
I barking up the wrong tree??
Any advice would be appreciated.
Cheers
Andy.
This archive was generated by hypermail 2.1.4 : Fri Dec 01 2006 - 08:05:49 ART