Configuring Sip Timer Values - Cisco 521SG - Unified IP Phone VoIP Administration Manual

Configuring SIP, SPCP, and NAT
Configuring SIP
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
Parameter
Hold Target
Before REFER
Dialog SDP
Enable
Display
Diversion Info

Configuring SIP Timer Values

All SIP timer values are in seconds. To configure SIP timer values, navigate to
Admin Login > advanced > Voice > SIP. Under SIP Timer Values (sec), make these
changes:
Parameter
SIP T1
SIP T2
SIP T4
SIP Timer B
SIP Timer F
Description
Controls whether to hold call leg with transfer target before
sending REFER to the transferee when initiating a fully-
attended call transfer (where the transfer target has
answered). Default value is "no," where the call leg is not
held.
Not applicable to Cisco WIP310.
When enabled and the Notify message body is too big
causing fragmentation, the Notify message xml dialog is
simplified; Session Description Protocol (SDP) is not
included in the dialog xml content.
Parses Diversion Header information in an incoming SIP
Invite and displays it as the Caller ID.
Description
RFC-3261 T1 value (RTT estimate). Ranges from 0 to 64
seconds. Defaults to .5 seconds.
RFC-3261 T2 value, the maximum retransmit interval for
non-INVITE requests and INVITE responses. Ranges from 0
to 64 seconds. Defaults to 4 seconds.
RFC-3261 T4 value, which is the maximum duration a
message remains in the network. Ranges from 0 to 64
seconds. Defaults to 5 seconds.
RFC-3261 INVITE transaction time-out value. Ranges from 0
to 64 seconds. Defaults to 16 seconds.
RFC-3261 Non-INVITE transaction time-out value. Ranges
from 0 to 64 seconds. Defaults to 16 seconds.
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