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11.5. Non-SIP Call port seizure preference
For non-SIP Calls, the port seizure preference is listed below
1. Inbound from PSTN
If the inbound FXO port was configured as "Fax" device, it will also seize only FXS ports that
"Connect Device" is configured as Fax. The Voice devices behave the similar way.
From FXO port to FXS port Note
Connect Device at FXO port Connect Device at FXS port
VOICE port Select VOICE port only From the lowest port number
upward
FAX port Select FAX port only From the lowest port number
upward
2. Outbound to PSTN
For the calls from FXS to FXO, the ports of the same "Connect Device" type will be the prior
selection for the calls.
If there is no correct configured port is available, it will ignore the "Connect Device" setting and
create a call as the rule below.
From FXS port to FXO port Note
Connect Device at FXS port Connect Device at FXO port
Select VOICE port (1
st
priority) VOICE port
Select FAX port (2
nd
priority)
From the highest port
number downward
Select FAX port (1
st
priority) FAX port
Select VOICE port (2
nd
priority)
From the highest port
number downward
For the setting of "Connect Device", please refer to 12.10 CHANNEL
11.6. Call Waiting
Call waiting function for a FXS port to answer two SIP calls.
When D answer a SIP call from other SIP phone or gateway, such as A. In normal condition,
another incoming call dial to D will be busy, such as B to D. With Call Waiting function, the phone
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