SIP timers settings

Use this page to set values for the Session Initiation Protocol (SIP) timers that are different from those specified in RFC 3261. SIP timers provide a mechanism for session expiration.The default values are the same as those specified for RFC 3261. To view this console page, click Servers > Server Types > WebSphere application servers > server_name > SIP container settings > SIP container > SIP stack > SIP timers.

The following SIP timers can be configured from the console.

T1

Amount of time, in milliseconds, for a network round trip delay for timer T1 according to the RFC 3261 specification. The value is used as a base for calculating some timers and is relevant for all types of transactions, such as client, server, invite, and non-invite transactions.

Information	Value
Data type	Integer
Default	500

A

Specifies, for UDP only, the amount of time, in milliseconds, before retransmitting invite requests for timer A according to the RFC 3261 specification. This setting is relevant for the invite client transaction.

Information	Value
Data type	Integer
Default	T1

B

Amount of time, in milliseconds, for the invite client transaction timeout timer (timer B) according to the RFC 3261 specification.

Information	Value
Data type	Integer
Default	T1*64

E

Specifies, for UDP only, the amount of time, in milliseconds, before the retransmission of the initial non-invite request for timer E according to the RFC 3261 specification. This setting is relevant for the non-invite client transaction.

Information	Value
Data type	Integer
Default	T1

F

Amount of time, in milliseconds, for the non-invite transaction timeout timer (timer F) according to the RFC 3261 specification. This setting is relevant for the non-invite client transaction.

Information	Value
Data type	Integer
Default	T1*64

G

Amount of time, in milliseconds, before retransmission of an initial invite response for timer G according to the RFC 3261 specification. This setting is relevant for the invite server transaction.

Information	Value
Data type	Integer
Default	T1

H

Amount of time, in milliseconds, to wait for an acknowledgement (ACK) receipt for timer H according to the RFC 3261 specification. This setting is relevant for the invite server transaction.

Information	Value
Data type	Integer
Default	T1*64

J

Amount of time, in milliseconds, to wait for non-invite request retransmission for timer J according to the RFC 3261 specification. This setting is relevant for the non-invite server transaction.

Information	Value
Data type	Integer
Default	T1*64

T2

Maximum amount of time, in milliseconds, before retransmitting non-invite requests and invite responses for timer T2 according to the RFC 3261 specification.

Information	Value
Data type	Integer
Default	4000

T4

Maximum amount of time, in milliseconds, for a message to remain in the network. This value is used as a base for calculating other timers for timer T4 according to the RFC 3261 specification.

Information	Value
Data type	Integer
Default	5000

I

Amount of time, in milliseconds, to wait for an ACK retransmission for timer I according to the RFC 3261 specification. This setting is relevant for the invite server transaction.

Information	Value
Data type	Integer
Default	T4

K

Amount of time, in milliseconds, to wait for non-INVITE response retransmissions for timer K according to the RFC 3261 specification. This setting is relevant for the non-invite client transaction.

Information	Value
Data type	Integer
Default	T4

D

Amount of time to wait, in milliseconds, before retransmission of the invite response for timer D according to the RFC 3261 specification. This setting is relevant for the invite client transaction.

Information	Value
Data type	Integer
Default	32000

Related

SIP proprietary header fields