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you have a recording on a menu that has been stored as GSM, you would need to use |
a format interpreter to play that recording to any channels not using the GSM codec.4 |
If you store a recording in several formats simultaneously (such as WAV, GSM, etc.), |
Asterisk will determine the least costly format5 to use when a channel needs to play |
that recording. |
4 It is partly for this reason that we do not recommend the default GSM format for system recordings. WAV |
recordings will sound better and use fewer CPU cycles. |
5 Some codecs will impose a significant load on the CPU, so much so that a system that might support several |
hundred channels without transcoding will only handle a few dozen when transcoding is in use. |
Modules |
| |
15 |
Table 2-7. Format interpreters |
Name |
format_g729 |
format_gsm |
format_h264 |
format_ilbc |
Plays files stored in |
G.729: .g729 |
RPE-LTP (original GSM codec): .gsm |
H.264 video: .h264 |
Internet Low Bitrate Codec: .ilbc |
Graphic file: .jpeg, .jpg |
format_jpeg |
format _ogg_ vorbis Ogg container: .ogg |
format_pcm |
format_siren14 |
format_siren7 |
format_sln |
format_vox |
format_wav |
format_wav_gsm |
Various Pulse-Coded Modulation formats: .alaw, .al, .alw, .pcm, .ulaw, .ul, .mu, .ulw, .g722, .au |
G.722.1 Annex C (14 kHz): .siren14 |
G.722.1 (7 kHz): .siren7 |
8-bit signed linear: .sln, .raw |
.vox |
.wav |
GSM audio in a WAV container: .wav, .wav49 |
Dialplan Functions |
Dialplan functions, listed in Table 2-8, complement the dialplan applications (see |
“Applications” on page 11). They provide many useful enhancements to things like |
string handling, time and date wrangling, and ODBC connectivity. |
Table 2-8. A curated list of useful dialplan functions |
Name |
func_audiohook |
inherit |
func_blacklist |
func_callcomple |
tion |
func_callerid |
func_cdr |
func_channel |
func_config |
func_curl |
func_cut |
func_db |
func_devstate |
func_dialgroup |
func_dialplan |
func_env |
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