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ZIP2x2 User’s Manual
6.3.2 Ringback
6.3.2.1 ZIP to SIP Phone Calls or ZIP to ISDN Calls
When you make a call to another SIP phone, the ringback that you hear is generated by your
phone. The tones will be those for the country that you selected.
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.
6.3.2.2 ZIP 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 was established, as described in section 6.5 on page 59. Because
the speech path is open, you may hear busy tone although the phone indicates that you are
connected.
6.3.3 Far End Busy
If the person you are calling is busy, the phone either plays the busy tone for your country or the
busy tone that is generated by the phone network at the far end. This depends on if your server
is notified that the called party is busy. If your server is aware the called party is busy, your phone
flashes the LED on the call appearance button green for 750 ms and red for 250 ms. The display
changes to:
The phone stops the timer as soon as it receives notification that the called party is busy. The
phone maintains this state until you go on hook.
1. See section 8.4.7 on page 99 for details on selecting the country.
1. Ringing
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1. Far end busy
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