Caller-ID for redirected calls from SIP-PBX

摘要

Facilitating Voice over Internet Protocol (VoIP) phone calls where at least a portion of the phone call relies upon signaling exchanged as part of a Session Initiated Protocol (SIP) session conducted through a SIP Private Branch Exchange (SIP-PBX) is contemplated. Caller-ID and/or security measures may be implemented when to enable caller-ID when the SIP-PBX is untrusted.

主权项

1. A method of facilitating a Voice over Internet Protocol (VoIP) phone call when at least a portion of the phone call relies upon signaling exchanged as part of a Session Initiated Protocol (SIP) session, at least a portion of the SIP session occurring between an Enterprise SIP Gateway (ESG) and a SIP Private Branch Exchange (SIP-PBX), the method comprising:
determining a first SIP invite originating from a first device attempting to place the phone call to a second device, the first device being located upstream from the ESG, the first SIP invite including: i) a first invite address associated with the second device; ii) a first P-Asserted-Identity (PAI) associated with the first device; and iii) a first outside address assigned to facilitate transmission of Real Time Protocol (RTP) media over a wide area network (WAN) connecting the first device with the ESG, the RTP media supporting at least a portion of the phone call; associating a first cookie with the first invite; facilitating transmission of a second SIP invite from the ESG to the SIP-PBX, the SIP-PBX being connected to the second device and being located downstream from the ESG, the second SIP invite including: i) the first invite address; ii) the first PAI; and iii) the first cookie.