Zultys ZIP4x4, User Manual

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8. Using the Phone
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The phone will continue to use this name instead of the number for future displays during this
call.
If you have dialled the person using a SIP address, the phone will display this instead of a
number. It will try to break the name at a period (full stop), “at” symbol, or other punctuation.
The LED on the call appearance button flashes green for 750 ms and off for 250 ms.
You will hear nothing during this phase of the call.
8.3.2 Ringback
8.3.2.1 ZIP4x4 to SIP Phone Calls or ZIP4x4 to ISDN Calls
When you make a call to another SIP phone, the ringback that you hear will be generated by your
phone. The tones will be those that you have selected for the country.
1
If you are making a call to the PSTN, the SIP to PSTN gateway normally opens the
communication path so that you hear the sound coming from the network. Therefore, if you are
calling a different country you will hear the ringback tone from that country. This tone may be
different from that used in your country.
The LED on the call appearance button continues to flash green for 750 ms and off for 250 ms. The
display changes to:
The timer continues to show the time since you initiated the call.
8.3.2.2 ZIP4x4 to CAS Calls
If you are connected to the PSTN using T1 CAS circuits, your SIP to PSTN gateway may not know
the status of the connection. It may open the speech path even though there is no ringback. The
LED on the call appearance button will then be lit solidly green.
The phone behaves as if the call has been established as described in section 8.5 on page 89.
Because the speech path is open, you may hear busy tone although the phone indicates that you
are connected.
1. See section 9.5.7 on page 127 for details on how you select the country.
1. Ringing
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