User guide

Page 169
Example of a Remote Site without an MGCP/SIP Gateway Application
System Features
Inter-Tel
®
Axxess
®
Administrator Guide — Issue 11.0, May 2008
The following diagram illustrates a remote site with an MGCP/SIP gateway.
Figure 6. Example of a Remote Site without an MGCP/SIP Gateway Application
Figure 7. Example of a Remote Site with an MGCP
/SIP Gateway Application
NOTE: The MGCP/SIP gateway is intended to connect to the PSTN. Connecting the MGCP/
SIP gateway to single-line ports on other telephone systems is currently not supported.
IPRC
Axxess System
PSTN
IP NETWORK
IP Endpoint
911
Operator
Located in Orange, CA
Caller ID Display:
714-283-1600
480-961-9000
Located in Phoenix, AZ
480-961-9000
Remote Site
Caller dials 911
In Phoenix, AZ
IPRC
Axxess System
PSTN
IP NETWORK
IP Endpoint
911
Operator
Located in Orange, CA
Caller ID Display:
714-283-1600
714-283-1600
Located in Phoenix, AZ
480-961-9000
Remote Site
MGCP/SIP
Gateway
(i.e., AudioCodes)
Caller dials 911
In Orange, CA
CAUTION
If an IP or SIP device user dials 911/999 from a remote location and an MGCP/SIP gateway
is not present and configured properly, the call will be placed from where the telephone sys-
tem is located. Because 911/999 services use Caller ID to help locate the caller, emergency
service 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/SIP 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/SIP gateway. Inter-Tel also recommends that users reg-
ularly test the MGCP/SIP gateway for dial tone.