Panasonic KX-TDA200 Features Manual page 351

When a call is made via the private IP network, if the PBX does not receive a reply from the other PBX within
about 4 seconds of making the call, or an error is returned, the call is rerouted to a public trunk as specified.
Conditions
•
Hardware Requirement: An IP-GW card
•
Some QSIG services are available. (® 1.30.4 QSIG Standard Features)
•
TRS/Call Barring settings apply to calls rerouted to public trunks.
Installation Manual References
2.3.8 IP-GW4 Card (KX-TDA3480)
PC Programming Manual References
3.34 [1-1] Slot—Port Property - IP-GW Port
4.9 [2-6-2] Numbering Plan—Quick Dial—
work
11.1 [9-1] TIE Table
PT Programming Manual References
None
Feature Guide References
1.30.1 TIE Line Service
1.30.2 Voice over Internet Protocol (VoIP) Network
Use quick dial for rerouting to public CO when TIE line does not
Feature Guide 351