Chris & Brian, Thanks. 

I finally manged the paging working for AASTRA phones. This is modified intercom dialplan with group_call


<extension name="extension-paging">
      <condition field="destination_number" expression="^8000$">
<action application="set" data="dialed_extension=$1"/>
<action application="export" data="sip_auto_answer=true"/>
<action application="bridge" data="${group_call(pagegroup@${domain_name})}"/>
      </condition>
    </extension>

I will try the multicast with a  Cisco Router support GRE

Lloyd
On Tue, Mar 23, 2010 at 3:46 PM, Brian West <brian@freeswitch.org> wrote:
Multicast goes over GRE tunnels :P
/b

On Mar 23, 2010, at 2:42 PM, Chris Chen wrote:

> Hi Lloyd, in the Aastra phone you may set up to receive the multicast paging by "Group Paging RTP Settings " under "preferences", just put multicast IP address and port, then you can do multicast paging, however if I am understanding correctly it only working in LAN environment, I don't think you can forward multicast traffic through internet unless you sign up the multicast services.
>


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