InnoMedia HG8328-1W Administrative Guide
Page 22
Copyright © 2019 InnoMedia. All rights reserved.
or 30ms)
Opus/48000/2 - Set Ptime, dynamic
payload type, wideband|narrowband
mode, and vbr (variable bit rate)|cbr
(constant bit rate).
Telephone Event
RFC2833 payload type
4.1.5
SIP Timer Setting
SIP timers define transaction expiration timers, retransmission intervals when UDP is used as a transport, and
the lifetime of dynamic TCP connections. The retransmission and expiration timers correspond to the timers
defined in RFC 3261.
Figure 16. SIP Timer Setting
Basic Timer
Description
Round Trip Time
Estimate (T1)
Estimated time it takes for a packet to make
a round trip from the device to the far end
and back.
Max Retransmit
Interval (T2)
The maximum retransmit interval for non-
INVITE requests and INVITE responses.
Invite Retry Times
The maximum number of times that a SIP
INVITE is retransmitted if no response is
received. According to RFC3261, INVITE
requests are retransmitted at an interval
which starts at T1 and doubles until it hits
T2, and then repeats at interval T2. The
MTA stops retries when a 32 second cap is
reached, or the max number of INVITE
retries has been attempted.
