Codec Negotiation - Siemens HIPATH 8000 HIPATH 8000 Administrator's Manual

Alphabetical Reference

Codec Negotiation

The following table indicates which codec will be selected depending on
which codec is selected on each phone, a G711 always option is included
because some non-Siemens phones may include this option.
High
Phone B
Quality
Preferred
Phone A
(Codec
G729)
High Quality G722
Preferred (G729)
High Quality G722
Preferred (G723)
Low Band G729
Preferred
(over 729)
Low Band Pre- G729
ferred (over 723)
Low Band Only G729
(over 729)
Low Band Only
G723
(over 723)
G711 Preferred G711
(Codec 729)
G711 Preferred G711
(Codec 723)
G729 Preferred G729
(Codec 723)
G729 Preferred G729
(Codec 729)
* Note that the B party uses a codec in the preferred order of the A party and this regarding RFC 3264 section 6.1.
Note that the table is read with Phone A calling Phone B. The table is not
symmetrical so does not describe the situation if B calls A. If a call is
cleared because the codecs are not compatible, the phone will display "Ter-
minal Incompatible".
Bandwidth calculation
Calculation into dependence of:
•
•
•
1. LAN
Maximum LAN-Overhead (Ethernet-Full Duplex per direction)
Protocol
RTP
UDP
IP
802.1Q VLAN Tagging
MAC (incl. Preamble, FCS)
Total
166
High Low Band Low Band
Quality Preferred Preferred
Preferred (over 729) (over 723)
(Codec
G723)
G722 G722 G722
G722 G722 G722
G729 G729 G729
G729 G723 G723
G729 G729 G729
G723 G723 G723
G711 G711 G711
G711 G711 G711
G729 G729 G729
G729 G729 G729
Codec
RTP packet size
Transmission medium
Low Low G711
Band Band Prefered
Only Only (over 729)
(over (over 723)
729)
* *
G729 G729 G722
* *
G723 G723 G722
G729 G729 G729
G723 G723 G723
G729 g729 G729
G723 G723 G723
* *
G729 G729 G711
* *
G723 G723 G711
G729 G729 G729
G729 G729 G729
G711 G729 G729
Prefered Prefered Prefered
(over 723) (over 723) (over 729)
G722 G722 G722
G722 G722 G722
G729 G729 G729
G723 G723 G723
G729 G729 G729
G723 G723 G723
G711 G711 G711
G711 G711 G711
G729 G729 G729
G729 G729 G729
Bytes
12
8
20
4
26
70