You're experiencing one of the issues with your notebook computer or your PC?
- Noisy and choppy sound during a telephone conversation
- A sound as if a Formula 1 car starts and switches the gear
- Bad audio quality and dropouts during the phone call
In most cases is the root cause the sound board or the headset. Quite often do manufacturers place the electrical components of notebook computers so close to each other that you can hear noise originating from other electronic components. The same is true for some desktop PCs as well.
Possible root causes on the client side (sound board, headset, internet connection):
- Quality of the Headset (very important)
- Integrated sound board (manufacturers very often inegrate AC97/Realtek)
- Connectors of the audio board
- Bandwidth of your internet connection (T1, DSL,...)
The best and easiest solution is to use a USB headset. Normally, USB headsets/handsets have their own sound board driver (please check when you make a purchase). USB headsets/handsets with dedicated driver always feature very good sound quality.
Possible root causes on the SIP server / PBX side:
- Packet losses in the network (particularly when a "clicking noise" can be heard)
- Bad codec implementation of the PBX system (quite often experienced with self-made Asterisk implementations)
- Codec conversion of the PBX system (e.g.: if service providers want to keep data traffic very low)
In the case of "clicking noise", please check your network for possible link failures or packet losses. For general sound quality issues, pleae deactivate all CODECS with the exeption of G711a/u in order to yield "landline" quality. In this case is the SIP server forced to use only the G711 codec. This codec features no data compression at all.
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