Product specifications

Dialogic® BorderNet™ 4000 SBC Product Description Document

8. Interworking Function (IWF)

The Interworking Function (IWF) connects clients with different capabilities, including

different protocol dialects.

BorderNet 4000 SBC B2BUA architecture supports the following IWF capabilities:

• IPv4-IPv6 IWF:

• SIP-to-IMS: The B2BUA adds or removes the IMS SIP protocol extensions (P-

headers) so that SIP clients can be connected to an IMS network.

• SIP, SIP-I, and SIP-T IWF: Interworking between SIP, SIP-I, and SIP-T.

• SIP Session Timers (ST) IWF: Session timers are used to monitor connectivity.

The B2BUA connects clients that have different session timer settings.

• Transport Interworking: The B2BUA supports multiple transport types (such as

TCP, UDP, and TLS) and connects clients with different transport protocols.

• SIP Profiler: The SIP Profiler allows extremely flexible alteration of incoming and

outgoing messages for improved interworking with otherwise incompatible versions

of SIP.

IPv4-IPv6 Interworking Function

The BorderNet 4000 SBC delivers enhanced connectivity through IPv4-IPv6 interworking.

The BorderNet 4000 SBC provides native IPv6 support and IPv6 for signaling and media, in

addition to allowing dual stack, simultaneous connections to both IPv4 and IPv6 networks.

Interworking scenarios include:

• IPv4 to IPv6

• SIP (IPv6) to H.323 (IPv4)

Note: IPv6 functionality requires a license. See Dialogic Technical Support for licensing

information.

SIP, SIP-I, SIP-T Interworking

The BorderNet 4000 offers a range of SIP and SIP-I/SIP-T interworking capabilities, such as

SIP-to-ISUP protocol mapping, management (add/modify/delete) of individual ISUP

parameters, call routing based on SIP profiles and ISUP parameters, and recording ISUP

contents in the Session Detail Records (SDR) for billing and analysis. The BorderNet 4000

SBC includes a built-in ISUP stack that is capable of decoding ISUP content embedded in the

SIP messages to extract various ISUP parameters. The BorderNet 4000 SBC’s SIP-to-ISUP

interworking follows the recommendations defined in ITU-T’s Q.1912.5 specification. The

BorderNet 4000 SBC’s interworking is complete in that it supports both SIP-to-SIP-I/SIP-T

conversion as well as SIP-I/SIP-T-to-SIP conversion.

H.323-to-SIP Interworking Function

The BorderNet 4000 SBC supports H.323 interworking gateway functionality by providing

originating and terminating call services using H.323 protocol with a remote gateway. The