issues with a Nortel i2004 IP phones over a Contivity VPN solution

Discussion in 'VOIP' started by Ken Gallagher, Nov 14, 2006.

  1. 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

    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!
    Ken Gallagher, Nov 14, 2006
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  2. 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, Nov 14, 2006
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