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Protocol bytes, Total – Siemens HIPATH 8000 User Manual

Page 166

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Alphabetical Reference

166

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.

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:

• Codec

• RTP packet size

• Transmission medium

1. LAN

Maximum LAN-Overhead (Ethernet-Full Duplex per direction)

High

Quality

Preferred

(Codec

G729)

High

Quality

Preferred

(Codec

G723)

Low Band

Preferred

(over 729)

Low Band

Preferred

(over 723)

Low

Band

Only

(over

729)

Low

Band

Only

(over 723)

G711

Prefered

(over 729)

G711

Prefered

(over 723)

G729

Prefered

(over 723)

G729

Prefered

(over 729)

High Quality

Preferred (G729)

G722

G722

G722

G722

G729

*

G729

*

G722

G722

G722

G722

High Quality

Preferred (G723)

G722

G722

G722

G722

G723

*

G723

*

G722

G722

G722

G722

Low Band

Preferred

(over 729)

G729

G729

G729

G729

G729

G729

G729

G729

G729

G729

Low Band Pre-

ferred (over 723)

G729

G729

G723

G723

G723

G723

G723

G723

G723

G723

Low Band Only

(over 729)

G729

G729

G729

G729

G729

g729

G729

G729

G729

G729

Low Band Only

(over 723)

G723

G723

G723

G723

G723

G723

G723

G723

G723

G723

G711 Preferred

(Codec 729)

G711

G711

G711

G711

G729

*

G729

*

G711

G711

G711

G711

G711 Preferred

(Codec 723)

G711

G711

G711

G711

G723

*

G723

*

G711

G711

G711

G711

G729 Preferred

(Codec 723)

G729

G729

G729

G729

G729

G729

G729

G729

G729

G729

G729 Preferred

(Codec 729)

G729

G729

G729

G729

G729

G729

G729

G729

G729

G729

*

Note that the B party uses a codec in the preferred order of the A party and this regarding RFC 3264 section 6.1.

Phone A

Phone B

Protocol

Bytes

RTP

12

UDP

8

IP

20

802.1Q VLAN Tagging

4

MAC (incl. Preamble, FCS)

26

Total

70