15 7월 IMS
Providing IP network-based calling service (VoIP, VoLTE) and additional call service equipment to operators at home and abroad
SIP Server
| Supply details | Stable VoIP service can be provided using equipment that processes SIP messages, which is the core protocol for the VoIP call service. |
|---|---|
| Customer |   |
AS
| Supply details | Supplied the telephony application server for the additional services during a VoIP valued added service (VAS) (.e.g., call forwarding, call rejection, two number service). |
|---|---|
| Customer |  |
MRF
| Supply details | Supplied media control equipment to process various media during a VoIP call (e.g., ringback tone, DTMF tone processing, etc.). |
|---|---|
| Customer |  and many others |
MGCF
| Supply details | Supplied equipment to relay calls between VoIP users and line exchange network users (e.g., PSTN, 3G user) on the IMS-based VoIP network. |
|---|---|
| Customer | |