User`s manual

AEQ PHOENIX MERCURY

b) Multicast: it is also possible to send the audio stream to a special “multicast” address, for

example, 239.255.20.8. If the receiving equipments call to that same IP, they will receive the

audio that is being sent provided that their “local media port” matches the one the transmitter is

sending the packets to. Similarly to broadcast, multicast traffic is usually blocked by switches

and routers, so its use is restricted to local area networks too.

c) Multiple-unicast: Phoenix units can send the same RTP stream to several different IPs by

replication of the encoded audio. This can traverse switches and routers in the same way it

would do if it was a simple (unicast) RTP Raw stream, although it is limited to a certain number

of destination IPs depending on the type of coding algorithm.

The “Multiple unicast” button (within the IP interface configuration screen Net1 or Net2) gives

access to an information window where the replicas that are active at a certain moment are

shown.

You can add replicas to a RTP call (or edit the existing ones) by previously creating a contact

that includes them (or by editing a existing contact). See section 5.1.7.1 of of “AEQ

ControlPHOENIX“ user’s manual.

Those replicas or parallel streams are only IP+port pairs we want to send the audio to. Note that

FEC can be individually activated provided that it was enabled (and configured) in the general

channel configuration (see section 3.4) or it can also be disabled for certain replicas if you want.

If the list is empty, the stream will be normally sent to the IP+port indicated in the Call window,

as usual.

NOTE: When audio is sent to several destinations, the transmitting unit can receive audio from

only one of them (or none). In order to determine which one is sending audio back, only in RTP

Raw mode, a control will appear in the general configuration window next to the ENCODER

output allowing us to disable the transmission to the IP channel. Make sure that only one of the

receiving equipments is enabled to transmit:

Channel transmission activated Channel transmission inhibited

NOTE: Please read the application notes published by AEQ regarding IP connectivity for

more information on IP communications in particular scenarios.