Billion Electric Company BiPAC 7402VL - Manual (Page 81)

VoIP/(802.11g) ADSL2+ Router
Chapter 4: Configuration
Attention
The following situation will make phone port 1 and 2 relay to PSTN line
automatically.
- Power down
- Internet Service fail, i.e., lost of WAN IP Address
- SIP service is not accessible. This excludes when:
User manually disables Registration.
User inserts a wrong authentication username or password.
User dials a wrong SIP number.
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