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Gigaset N870 IP PRO / Admin IE-UK-International en / A31008-XXXXX-XXXX-X-XX / settings_provider.fm / 8/10/21
Template Module, Version 2.1, 11.08.2020 / Template Basiseinstellungen: Version 3.1 - 07.07.2020
Provider and PBX profiles
69
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
RTP Packetisation Time (ptime)
Length of time in milliseconds represented by the audio data in one packet.
Select the size of RTP packets to send. Select between 10 / 20 / 30 ms.
Signalling options for 'Hold' in Session Description Protocol (SDP)
Call hold means that a user requests to put an active call on hold. The holding part sends a
re-INVITE request to the held client with an SDP offer (Session Description Protocol). This SDP
offer contains the attribute line a=inactive or a=sendonly.
Select which attribute should be sent in the SDP offer:
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 TelephonyVoIP page ( p. 81)
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.729A 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.
Codecs enabled Number of calls
G711 only 10
G729 and G711 8
G722 and G729 and G711 5
inactive The SIP endpoint would neither send nor receive data.
sendonly The SIP endpoint would only send and not receive data.
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