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Compatibility

What voice codecs does Callcentric support?
For calls from one Callcentric user to another any codec can be used.
For calls to the voicemail system and for error prompting the following codec's can be used:

G.711 u-law
G.711 A-law
G.729A

For calls to the PSTN (traditional landline and mobile phones) the following codec's can be used:

G.711 u-law
G.711 A-law
G.729A

For calls from the PSTN to your Real Phone Number the following codec's will be used:

G.711 u-law
G.729A

We recommend that you configure your user agent's codec selection in the following order (with 1 being the highest priority, and 3 the lowest), assuming your user agent supports each of the following. If your user agent doesn't support all of these codec's, just skip the ones that it does not have.

1 - G.711 u-law
2 - G.711 A-law
3 - G.729

All other codecs should be disabled for compatibility reasons. If you do enable codecs which are not listed above then keep in mind that this will only work with calls on the Callcentric network or to SIP URIs. If you wish to configure other codecs then the following order may be considered:

4 - G.722 48Kbps
5 - G.722 56Kbps
6 - G.722 64Kbps
7 - Speex 8Kbps
8 - Speex 16Kbps
9 - Speex 32Kbps
10 - G.726 16Kbps
11 - G.726 24Kbps
12 - G.726 32Kbps
13 - G.728
14 - iLBC