1. Have any phone dial a number which will page to all phones.
You will use unicast or multicast paging to accomplish this. See 'How to Configure Paging' in the CME admin guide. You only need multicast if the amount of phones in the group is above 10 (I think that's the number).
Any multicast address other than 224.x.x.x should be fine.
2. Have one to one paging setup so a number can be dialed and a single phone will be paged. They want this for every phone.
Intercom can be used for this. See 'Configuring Intercom Lines.' You will want a button for each unique destination that you have.
As for the intercom, it seems like that uses a dedicated line button to link two phones. Is there a way to configure it to have a dialed number buzz ther other phone? Like a unicast page but allow two way communication.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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This provides an easy to use form where you simply answer a few
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