Comdif Telecom is specialist on embedded Voip in router. What are the advantages
Comparing to local Sip server:
- Save server price - Be sure if network and router is on, Sip server is on - No more NAT failure
Comparing to Centrex:
- Save bandswitch, internal call use only Lan - Can use local FXO Gateway for backup - Keep your phone system working in case of Wan failure - Free choice for Sip provider
In all cases this system is very cheap and easy for maintenance, all is Embedded on Flash Usb key, just change the key with a copy to restore your PBX. Embedded is also very low power consumption and is a very green device.
Disadvantage is only that you are not on a powerfull server and use is only for smal business.