Welltech SIPIVR 6800GS V.2.1 - Manual (Page 16)

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transaction, to store the internal fields. For example, the call-legs object
will store the To, From and Call-ID headers and the local and the remote
contact addresses on the general pool pages. The general pool is also
used from other activities that demand memory allocation.
• Application Pool Page Size: The size of page in the application pool.
• Retransmission T1:T1 determines several timers as defined in RFC3261.
For example, when an unreliable transport protocol is used, a Client Invite
transaction retransmits requests at an interval that start at T1 seconds and
doubles after every retransmission. A Client General transaction
retransmits requests at an interval that starts at T1 and doubles until it
reaches T2. (Default Value: 500)
• Retransmission T2: Determines the maximum retransmission interval as
defined in RFC3261. For example, when an unreliable transport protocol
is used, general requests are retransmitted at an interval which starts at
T1 and doubles until reaches T2. If a provisional response is received,
retransmission continue but at an interval of T2. (Default Value: 4000)
• Retransmission T4:T4 represents the amount of time the network takes to
clear message between client and server transactions as defined in
RFC3261. For example, when working with an unreliable transport
protocol, T4 determines the time that UAS waits after receiving an ACK
message and before terminating the transaction. (Default Value: 5000)
• Invite Linger Timer: After sending an ACK for an INVITE final response, a
client cannot be sure that the server has received the ACK message; the
client should be able to retransmit the ACK upon receiving retransmissions
of the final response for invite Linger Timer milliseconds.
• General Linger Timer: After a server sends a final response, the server
cannot be sure that the client has received the response message. The
server should be able to retransmit the response upon receiving
retransmissions of the request for general Linger Timer milliseconds.
(Default Value: 32000)
• Provisional Timer: When a client receives a provisional response, it
continues to retransmit the request, but with an interval of provisional
Timer milliseconds.
• Cancel General No Response Timer: When sending a CANCEL request
on a General transaction, the User Agent waits cancel General No
Response Timer milliseconds before timeout termination if there is no
response for the cancelled transaction.
• Cancel Invite No Response Timer: When sending a CANCEL request on a
Invite transaction, the User Agent waits cancel Invite No Response Timer
milliseconds before timeout termination if there is no response for the
cancelled transaction.
• General Request Timeout Timer: After sending a General request, the
User Agent waits for a final response general Request Timeout Timer
milliseconds before timeout termination (in this time the User Agent
retransmits the request every T1, 2*T1,…T2,…milliseconds)
• Send 487 When Recv CANCEL: When receive CANCEL form remote site,
send “487 Request canceled” or not
• Hold Mode: The SIP hold message mode.
- Send Only: SDP Media Attribute will be set Send Only when send