In SIP network, the media always using end-to-end to hand the consultation. In some
particular situation or business processing, such as “Music On Hold”, SIP server will
actively participate in the media negotiation. Simple SIP server is responsible only for
establishment, maintenance and cleaning conversation, don't interfere in call. While
relatively complex SIP server also called SIP PBX. It not only provides the basic call, and
basic conversational support, also offer plenty of business, such as: Presence, Find-me,
Music On Hold.
3)SIP server based on Linux platform, such as: OpenSER、sipXecx,VoS,Mera etc.
4)SIP server based on windows platform, such as :mini SipServer、Brekeke,VoIPswitch
etc.
5)Carrier grade soft-switch platform, such as Cisco, Huawei, ZTE etc.
SIP server configuration interface as follows: