1. grandstream ucm 6204 ip pbx
2. built in recording
3. supports call queue for efficient call volume management
4. supporters up to 5-level ivr (interactive voice response)
5. dual gigabit network ports with integrated poe
6. built in call detail records
7. sip video endpoints support (h.264, h.263, h.263+)
8. voicemail and fax forwarding to email
9. integrated ldap and xml phone books, flexible dial plan
10. zero config provisioning of grandstream sip endpoints
11. call features: call park, call forward, call transfer, dnd, right/hunt group, paging/intercom