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As far as I am aware there isn’t a way for * to
receive/send audio to a multicast group. There needs to be a way
for Asterisk to tell the phone which ip multicast group to join in order to
receive the page. This method varies by vendor. I know that
with Cisco ip phone multicast paging they send a SCCP message to the phone to
instruct it to send the appropriate IGMP join for the multicast group. Another way would be to advertise the ip multicast groups
with SDP. Do you know how the Zultys phone knows which ip multicast
group to join? I hope
they aren’t statically tying themselves to 224.0.0.1 as this is a
reserved ip multicast address always has a TTL of 1. If they are using this address have them
read RFC 1112. >>>The reason? I have found a method to paging on
Zultys ZIP2 and ZIP4x4 handsets. Basically it involves sending a stream of RTP
data to port 3771 to multicast address 224.0.0.1. |
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