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Operational Features
41-001343-02 REV04 – 05.2014 5-83
How it works
After pressing a configured “Paging” key on the phone, the phone sends an RTP stream to a preconfigured multicast
address (IP port). Any phone in the local network then listens for the RTP stream on the preconfigured multicast address
(IP port). For both sending and receiving of the multicast RTP there is no sip signaling involved. When the phone sends or
receives a multicast RTP, it shows its involvement to the user by displaying "Paging".
The phone uses a preconfigured G711 uLaw CODEC for multicast RTP.
For Paging Systems, the phone only plays RTP traffic; users have the ability to drop a rogue page. The recipient can drop
the incoming page if required. The recipient can also set Do Not Disturb (DND) to ignore any incoming pages.
For incoming RTP multicasts, the ringing display is dependant on the “Allow Barge-In” parameter. If this parameter is dis-
abled, and there is not other call on the phone, then the paging is automatically played via the preferred audio device (see
the <Model-Specific> IP Phone User Guide for setting Audio Mode on the phone).
If there is an existing call on the phone, the call initially displays in the ringing state. The user has the option to
accept/ignore the call. If the “Allow Barge-In” parameter is enabled, the RTP multicast call barges in, and any existing calls
are put on hold.
If an RTP multicast session already exists on the phone, and the phone receives another incoming RTP multicast session,
the priority is given to the first multicast session and the second multicast session is ignored. The behavior for the incom-
ing calls in this case is also based on the setting for the “Allow Barge-in” parameter. The incoming call is handled as if
there were an existing call already on the phone.
Configuring Group Paging RTP Settings
Use the following procedure to configure Group Paging RTP Settings using the configuration files.
Use the following procedure to configure RTP streaming for Paging applications using the Aastra Web UI
.
Note:
Multicast RTP is one way only - from sender to the receiver (i.e. from sender to the multicast address (receiver)).
Note:
For outgoing RTP multicasts, all other existing calls on the phone are put on hold.
Configuration Files
For specific parameters you can set in the configuration files, see Appendix A, the section, “Group Paging RTP Settings” on pageA-147.
Aastra Web UI
1. Click on Basic Settings->Preferences->Group Paging RTP Settings.
2. In the “Paging Listen Addresses” text box, enter the multicast IP address(es) and port number(s) on which the phone listens for incoming
multicast RTP packets.
Notes:
• Enter the IP address in dotted decimal format (for example, 224.0.0.2:10000,239.0.1.20:15000) If this field is blank, Paging listening
capability is disabled on the phone.
• The valid port range is from 1 to 65535.