Nortel SRG50, Configuration Manual

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91
Survivable Remote Gateway 50 Configuration Guide
Chapter 7
Considerations for PSTN access and analog devices
SRG-specific items relevant to PSTN trunks and analog devices include:
• “Considerations for PSTN access” on page 91
• “Considerations for analog devices” on page 92
Considerations for PSTN access
1 PSTN access
To provide access to the SRG50 PSTN when the SRG50 is in local mode, or to be able to set
up tandem dialing from the main office through the SRG50 to the SRG50 PSTN, one or more
PSTN trunks must be configured on the system. Refer to the
BCM50 Networking
Configuration Guide (N0027156).
2
Tandem calls
The SRG50 considers all calls coming in over the VoIP trunks as remote access calls, even
though the VoIP pathway is a dedicated trunk to another closed system.
To allow tandem dialing from the main office to the SRG50 PSTN, or to allow redirected
SRG50 IP telephones to use the SRG50 local PSTN, a remote access package must be
specified to provide access to the PSTN line pool. This procedure is covered in
“Call
routing: configuring for outgoing calls” on page 86 .
3 Manual- and auto-answer lines
If the trunk is configured as a manual-answer line:
Enter the line pool access code and the dial string for the main office attendant telephone in the
Redirect to field (Configuration > Telephony > Lines > Active Physical Lines).
If the line is an auto-answer line in normal mode, incoming call requests are automatically call
forwarded to the main office. When the SRG50 IP telephones revert to local mode, the system
discontinues Call Forward All Calls and calls are delivered directly to the SRG50 IP
telephones at the SRG50.