| 摘要 |
A system for IMS bridging includes an I-CSCF, a BGCF, an S-CSCF and an MGCF; and a method for IMS bridging, including: a caller starting a call, and an I-CSCF routing the call according to a network where the caller locates. According to this invention, the MGCF and S-CSCF can only interwork with entities of the local network. Only the I-CSCF (or via the I-BCF) and BGCF can interwork with entities of external networks. Therefore, this invention can simplify the network and facilitate unified routing management. Alternatively, IP routing may be implemented via the I-BCF only and this also reduces the security risks of the network since the topology information is not exposed.
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