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Posted by Ken Gallagher on November 14, 2006, 12:46 pm
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I forgot to mention. The Telephones are using a BCM 400 as the
telephony solution, which is connected to a Cisco Catalyst 3560 switch
in the same VLAN and IP subnet as the Contivity 600.
Ken Gallagher wrote:
> Hi, all. I was wondering if anyone could help me
>
> Recently, we deployed an IP telephony solution where Nortel i2004
> telephones are connected to Nortel Contivity 221 VPN switches. The
> Contivity 221 is then connected to an ADSL modem which provides
> Internet Connectivity. Through an IPSEC tunnel in Aggressive mode
> (since the IP addresses for the Contivity 221s are dynamically
> assigned), we then connect to a Contivity 600 which uses a 5 megabit
> LAN extension circuit as its Internet connection. The Contivity 600
> has a static IP address
>
> The tunnels seem to stay up constantly, however, and I never drop any
> pings.
>
> We're experiencing frequently disconnected calls on all the IP
> telephones at random intervals. There doesn't seem to be any pattern.
> I'm also not seeing the VPN tunnels themselves drop more than every 24
> hours (which is the timeout we set on the VPN tunnels).
>
> The keep alive timer is set to 1 minute on the Contivity 600, and on
> the 221s, we have the VPN sessions set to "Nailed Up". The ADSL lines
> are completely error free.
>
> Does anyone have any idea what might be causing the periodic drops?
>
> Thanks very much!
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