Sip Timer Values (Sec) - Cisco IP Phone 6851 Administration Manual

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Parameter
Hold Target Before Refer
Dialog SDP Enable
Keep Referee When Refer Failed
Display Diversion Info
Display Anonymous From Header
Sip Accept Encoding
Disable Local Name To Header
SIP IP Preference
Disable Local Name to Header

SIP Timer Values (sec)

Parameter
SIP T1
SIP T2
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
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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: No
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.
If set to yes, it configures the phone to immediately handle NOTIFY
sipfrag messages.
Display the Diversion info included in SIP message on LCD or not.
Show the caller ID from the SIP INVITE message "From" header when
set to Yes, even if the call is an anonymous call. When the parameter
is set to no, the phone displays "Anonymous Caller" as the caller ID.
Supports the content-encoding gzip feature. The options are none and
gzip.
If gzip is selected, the SIP message header contains the string
"Accept-Encoding: gzip", and the phone is able to process the SIP
message body, which is encoded with the gzip format.
The options are No and Yes. If No is selected, no changes are made.
The default value is No.
If Yes is selected, it disables the display name in "Directory", "Call
History", and in the "To" header during an outgoing call.
Sets if the phone uses IPv4 or IPv6.
Default: IPv4.
Select Yes to enable or No to disable.
Default: No
Description
RFC 3261 T1 value (RTT estimate) that can range from 0 to 64 seconds.
Default: 0.5 seconds
RFC 3261 T2 value (maximum retransmit interval for non-INVITE
requests and INVITE responses) that can range from 0 to 64 seconds.
Default: 4 seconds