P31003C1020M1000276A9, 01/2018
OpenScape Cordless IP V2, Administrator Documentation
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Provider and PBX profiles
Configuring telephony server profiles
Both parties involved in a phone connection (caller/sender and recipient) must use the same voice codec. The
voice codec is negotiated between the sender and the recipient when establishing a connection.
Active codecs / Available codecs
The following voice codecs are supported:
Activate/deactivate a codec:
Select the required codec from the
Available codecs
/
Active codecs
list and click on / .
Define the sequence in which the codecs should be used:
In the
Active codecs
list select the required codec and click on / to move it up/down.
Number of parallel calls per base station depending on bandwidth
G.722 Outstanding voice quality. The G.722 wideband voice codec works at the same bit rate as PCMA/PCMU
(64 kbit/s per voice connection) but at a higher sampling rate (16 kHz).
To enable wideband connections via G.722 you have to activate the codec explicitly on the
Telephony
–
VoIP
page ( p. 61)
PCMA/
PCMU
(Pulse Code Modulation) Excellent voice quality (comparable with ISDN). The required bandwidth is 64
kbit/s per voice connection.
PCMA (G.711 a law): Used in Europe and most countries outside of USA.
PCMU (G.711
μ
law): Used in USA.
G.729
A
Average voice quality. The necessary bandwidth is less than or equal to 8 kbit/s per voice connection.
Selection of codecs G.722 and G.729 influence the system capacity in direction to lower amount of
parallel calls per base station.
Codec
Narrow band / wide band
Number of calls
G711
Narrow band
10
