System information

Configuring Voice
Configuring Voice Settings
Cisco SPA100 Series Phone Adapters Administration Guide 69
4
RTCP Tx Interval 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.
No UDP Checksum Select yes if you want the ATA to calculate the UDP
header checksum for SIP messages. Otherwise,
select no. Default setting: no.
Stats In BYE 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
Field Description