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System Hardware
Inter-Tel
®
Axxess
®
Administrator Guide — Issue 11.0, May 2008
MGCP Gateway and Endpoints
MGCP Gateway and Endpoints
The system also supports IP-based solutions for providing local Public Switched Telephone
Network (PSTN) connectivity using the IPRC and a third-party Media Gateway Control Proto-
col (MGCP) device. For information about currently supported MGCP devices, contact your
local authorized Inter-Tel dealer.
SIP Gateway
Axxess supports SIP (Session Initiated Protocol) trunks communication with the CO via SIP-
enabled gateways. As the SIP protocol becomes more popular, it is important to be able to
communicate to SIP gateways in the IP-centric world. Inter-Tel currently supports the follow-
ing SIP gateways:
•
Quintum
®
AFT 400 SIP gateway
•
AudioCodes
™
MP-114 SIP gateway
The above-mentioned gateways replace the AudioCodes MP-104 SIP Gateway that has gone
end-of-life in October 2006. Existing Axxess systems must upgrade to v10.0 or later to support
these gateways.
SIP trunks support the following functionality:
•
They are transparent to the system user because SIP trunks work like any other CO
trunk in the system.
•
They support transferring trunks, putting trunks on hold, and connecting trunks to con-
ferences, similar to other CO trunks in the system.
•
They support making and receiving calls by any endpoint.
•
They support peer-to-peer audio by IP endpoints.
•
They reside in CO trunk groups just like other trunks so that SIP trunk calls can be
routed using Automatic Route Selection (ARS).
•
They support 911 calls (like MGCP trunks).
SIP trunks require:
•
An IPRC with v8.1.x or later firmware.
•
A SIP trunk software license (part number 840.0267).
NOTE:
SIP trunks do not support the Direct Inward System Access (DISA) or speed dial fea-
tures.
CAUTION
If an IP or SIP device user dials 911/999 from a remote location and an MGCP gateway is
not present and configured properly, the call will be placed from where the telephone system
is located. Because 911/999 services use Caller ID to help locate the caller, emergency ser-
vice could be misdirected or delayed. Also, the 911/999 service contacted may be local to
the system, but not to the IP or SIP device. All IP and SIP device users should be alerted to
this situation and instructed to use a local telephone line for placing emergency calls if an
MGCP gateway is not present and/or functioning properly. Also note that IP and SIP devices
will not function in the event of a power failure at either the local site or the system location.
Inter-Tel will not be held responsible for any problems resulting from an unavailable line that
is connected to the MGCP gateway. Inter-Tel also recommends that users regularly test the
MGCP gateway for dial tone.
Summary of Contents for Inter-Tel Axxess
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