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  • Can remote VOIP phones connect to HQ Shoretel Server?

    Hi All,

    I want to say thank you for the excellent help I have received on this Forum.

    Our Remote Office (West Coast) needs to connect to our HQ's (East Coast) ShoreTel infrastructure in order to make VOIP-based phone calls.

    System Info:
    [OS Platform] Windows 2003 Server
    [ShoreTel v#] ShoreTel 6 (Build 11.12.7308.0)
    [DeskPhones] ShoreTel 530 DeskPhones (Requires PoE)

    HQ (East Coast) Network Info:
    >T1 Dedicated to local VOIP traffic
    >ShoreTel Server, ShoreGear T1, and ShoreGear 60/12 (ShoreTel demark and switching components) are on internal network
    >All are connected to a 3Com switch with ~2% bandwidth utilization (extremely high ceiling - QoS enabled or not, quality is perfect)
    >VPN is hosted in RTP via a PIX FW (no dedicated links exist between offices)

    REMOTE (West Coast) Network Info:
    >Basic DSL (no static IPs available under current contract)
    >Working with a Motorola Modem from TW connected to a SIMPLE Linksys Router (5 ports)
    >ONLY 1 VOIP call will occur at once (no need for simultaneous calls)
    >DHCP Broadcast traffic has been eliminated with Static IPs in order to clear the road for the VOIP installation

    1) Would the REMOTE VOIP DeskPhone need to be on a VPN connection in order to connect to the HQ ShoreTel Environment?
    [If so] Would the DeskPhone need to be plugged into a PC (with ICS or NAT enabled) in order to gain the VPN connection?
    2) Could this service be hosted from our HQ DMZ via a Public Static IP in order to save bandwidth?
    [Concern] VPN can really chew up what little bandwidth is available
    3) A SoftPhone is not the preferred solution, but would it be the most practical?

    Any advice on this matter would be greatly appreciated. Many thanks in advance for your time and consideration.

    Warm Regards,


  • #2
    There are two major routes:

    1. Replace remote router with PIX or ASA. Set up a VPN to the device at the main office.

    2. Use softphone. Install this Cisco VPN client on the machine to connect back to the main office.

    I would also recommend that you have this configured by a knowledgeable networking consultant, or take some time yourself to learn more about how things work.

    * There is no need to disable DHCP. In fact, setting some DHCP options is the easiest way to configure ShoreTel phones.

    * Audio connections from the phones go directly device-to-device. In order to avoid a VPN, any device you would want to call would need to be given a public IP. Unless you want your network compromised, this is not acceptable, hence the VPN requirement.

    * You need to ensure you have sufficient bandwidth on both ends. For example, for G.729 takes approx. 24 kbps. The IPSEC VPN adds approx. 21 kbps. (As per Cisco: