is there anyone know about network paging.
I made networking two systems and my customer want to page all or external paging from networked system.

Is it possible and how should I do?
I understand network numbering plan but I don't understand flexible DID.

Thank you for your helping

As best as I know internal all call paging does not work across SIP networking at the moment. External paging MAY work if you have an analog extension wired to a Viking PA-2A or similar device at the remote site and you dial/DSS that analog extension from the local site.

Flexible DID shouldn't play any part in it, just make sure the numbering plan is different for each site.

Internal and External paging both work across a network with the SBX but you cannot page both sites at the same time. In other words you can page from one site to another with the use of a net number and a matching did number pointed to paging at the receiving system. Example create a net number 7543 on site A, Route DID 543 at site B to internal paging (all call). When site a dials 7543 they will be paging site b. Do the reverse to page in the opposite direction.

Learn something new every day, I stand corrected. Nice, will have to keep that in mind.