Cisco SPA112 Administration Manual page 69

Configuring Voice
Configuring Voice Settings
Cisco SPA100 Series Phone Adapters Administration Guide
Field
RTCP Tx Interval
No UDP Checksum
Stats In BYE
Description
Interval for sending out RTCP sender reports on an
active connection. It can range from 0 to 255
seconds. During an active connection, the ATA can
be programmed to send out compound RTCP
packet on the connection. Each compound RTP
packet except the last one contains a SR (Sender
Report) and a SDES (Source Description) The last
RTCP packet contains an additional BYE packet.
Each SR except the last one contains exactly 1 RR
(Receiver Report); the last SR carries no RR. The
SDES contains CNAME, NAME, and TOOL
identifiers. The CNAME is set to <User
ID>@<Proxy>, NAME is set to <Display Name> (or
Anonymous if user blocks caller ID), and TOOL is
set to the Vendor/Hardware-platform-software-
version. The NTP timestamp used in the SR is a
snapshot of the ATA's local time, not the time
reported by an NTP server. If the ATA receives a RR
from the peer, it attempts to compute the round trip
delay and show it as the Call Round Trip
Delay value (ms) on the Voice > Information page.
Default setting: 0.
Select yes if you want the ATA to calculate the UDP
header checksum for SIP messages. Otherwise,
select no. Default setting: no.
Determines whether the ATA includes the P-RTP-
Stat header or response in a BYE message. The
header contains the RTP statistics of the current
call. Select yes or no from the drop-down list. The
format of the P-RTP-Stat header is:
P-RTP-State: PS=<packets sent>,OS=<octets
sent>,PR=<packets received>,OR=<octets
received>,PL=<packets lost>,JI=<jitter in
ms>,LA=<delay in ms>,DU=<call duration
ins>,EN=<encoder>,DE=<decoder>. Default
setting: Yes
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