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Two-Way Radio VoIP

I have 2 cisco shops(Hosp) that are tied together with a VPN that they setup. on the LAN the radio equipment works fine but I cannot get it accross the WAN. I have other equipment same MODEL and firm ware the works on the WAN. WE use UDP/IP in a unicast mode between LAN's on a LAN we may use multicast

this is the protocol we use.

The protocol used to alert routers to parties who are interested in

certain multicast address traffic is IGMP or Internet Group Management Protocol. The Vega

products support IGMPv1 as defined in RFC 1112.

With the information supplied looking for suggestions I can make to the network managers

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