Product specifications

Dialogic® BorderNet™ 4000 SBC Product Description Document

6. SIP Services

The Session Initiation Protocol (SIP) is a signaling protocol that establishes sessions in an IP

network. SIP interfaces connect trusted and untrusted networks, and each SIP interface is

associated with an IP interface (VLAN + IP address and port). The BorderNet 4000 SBC

supports SIP RFC3261 and UDP, TCP, and TLS transports for SIP.

The BorderNet 4000 SBC routes SIP sessions through a multilevel architecture between SIP

interfaces while providing the appearance of multiple virtual SIP gateways. The BorderNet

4000 SBC supports up to:

• 512 SIP interfaces

• 1,024 VLANs

• 2,048 IP interfaces

• 4,096 SIP peers

The BorderNet 4000 SBC parses and validates incoming SIP messages before admitting the

SIP messages into the system. Optional topology-hiding may also be employed to prevent

details of the SIP messages from being passed across the platform. At both ingress and

egress SIP interfaces, the SIP Profiler can add, modify, or delete contents of SIP messages

and headers to provide compatibility among incompatible SIP networks.

To further control the session, timers can be configured for each SIP interface:

Timer Values

SIP Timer T1

Estimates the round-trip message propagation time, which

is used to determine the minimum time before a message

should be re-transmitted.

Default value: 500 milliseconds

Range: 500 - 4,000 milliseconds,

configured in increments of 100 milliseconds

SIP Timer T2

Provides the maximum retransmission interval for non-

INVITE requests and INVITE responses.

Default value: 4,000 milliseconds

Range: 1,000 - 30,000 milliseconds,

configured in increments of 100 milliseconds

Maximum Number

of Retransmissions

Parameter

Defines the maximum number of times a SIP message will

be retransmitted by the BorderNet 4000 SBC.

Default value: 4

Range: 1 – 7

SIP Proxy Timer C

Sets the proxy INVITE transaction timeout. The timer starts

when a 1xx message is received and terminates if a 2xx

message is received. If a 2xx message is not received

before Timer C times out, the session is dropped.

Default value: 240 seconds