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Ringing Types and Intercom

Digium phones support several different types of ringing:

  • Normal Ringing - normal
  • One Ring followed by automated Answer - ring-answer
  • Immediate Answer, No ringing - intercom
  • Visual only, No ringing sound - visual

When an incoming call is received, the phone will look for an ALERT_INFO SIP header, and compare the received header against its configuration, as parsed from its Config XML.

Affecting the ring type from the Asterisk dialplan requires use of the alert_info SIP header. This header should be added into the dialplan before executing a dial to the phone, as such:

Selecting a Ringtone from the Dialplan
exten => 100,1,SIPAddHeader("Alert-Info: normal")
exten => 100,n,Dial(SIP/mypeer)
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Alert-Info elements encapsulated in angle brackets are currently not parsed correctly by the Digium phones. As such, users who require use of angle brackets for the first Alert-Info element, and who are using their own generated configurations, not provided by the DPMA, must use the escaped characters directly in the alert definition.

FreePBX Paging

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FreePBX and AsteriskNOW users using DPMA prior to 1.0.2 can modify the FreePBX database to allow ring-answer paging by performing the following:

sudo su -
amportal a m
INSERT INTO paging_autoanswer (useragent, var, setting) VALUES ('Digium', 'ALERTINFO', 'Alert-Info: ring-answer');
quit

and then reloading:

amportal reload
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