© 2003 - 2005 Sipura Technology, Inc
Proprietary (See Copyright Notice on Page 2)
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If inbound SIP requests contain normal headers, SPA will substitute those headers with compact
headers (if defined by RFC 261) if <Use Compact Header> parameter is set to “yes.”
4. During an active connection, the SPA 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 Verdor/Hardware-platform-software-version (such as Sipura/SPA2000-
1.0.31(b)). The NTP timestamp used in the SR is a snapshot of the SPA’s local time, not the time
reported by an NTP server. If the SPA receives a RR from the peer, it will attempt to compute the
round trip delay and show it as the <Call Round Trip Delay> value (ms) in the Info section of SPA
web page.
5. 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 in
s>,EN=<encoder>,DE=<decoder>
3.5.6.1. Dynamic Payload Types
Parameter Name
Description
Type
Default
NSE Dynamic Payload
1,2
NSE dynamic payload type
Uns8
100
AVT Dynamic Payload
1,2
AVT dynamic payload type
Uns8
101
G726r16 Dynamic Payload
1,2
G726-16 dynamic payload type
Uns8
98
G726r24 Dynamic Payload
1,2
G726-24 dynamic payload type
Uns8
97
G726r40 Dynamic Payload
1,2
G726-40 dynamic payload type
Uns8
96
G729b Dynamic Payload
1,2
G729b dynamic payload type
Uns8
99
Notes:
1. Valid range is 96 – 127
2. The configured dynamic payloads are used for outbound calls only where the SPA presents the
SDP offer. For inbound calls with a SDP offer, SPA will follow the caller’s dynamic payload type
assignments
3.5.6.2. SDP Audio Codec Names
Parameter Name
Description
Type
Default
NSE Codec Name
NSE Codec name used in SDP
Str31
NSE
AVT Codec Name
AVT Codec name used in SDP
Str31
telephone-event
G711a Codec Name
G711a Codec name used in SDP
Str31
PCMA
G711u Codec Name
G711u Codec name used in SDP
Str31
PCMU
G726r16 Codec Name
G726-16 Codec name used in SDP
Str31
G726-16
G726r24 Codec Name
G726-24 Codec name used in SDP
Str31
G726-24
G726r32 Codec Name
G726-32 Codec name used in SDP
Str31
G726-32
G726r40 Codec Name
G726-40 Codec name used in SDP
Str31
G726-40
G729a Codec Name
G729a Codec name used in SDP
Str31
G729a
G729b Codec Name
G729b Codec name used in SDP
Str31
G729ab
G723 Codec Name
G723 Codec name used in SDP
Str31
G723
Notes:
1. SPA uses the configured codec names in its outbound SDP
