added .vox (Dialogic/OKI ADPCM 8kHz format) to mod_sndfile

src/mod/formats/mod_sndfile/mod_sndfile.c

@@ -143,6 +143,10 @@ static switch_status_t sndfile_file_open(switch_file_handle_t *handle, const cha
 		context->sfinfo.format = SF_FORMAT_RAW | SF_FORMAT_ALAW;
 		context->sfinfo.channels = 1;
 		context->sfinfo.samplerate = 8000;
+	} else if (!strcmp(ext, "vox")) {
+		context->sfinfo.format = SF_FORMAT_RAW | SF_FORMAT_VOX_ADPCM;
+		context->sfinfo.channels = 1;
+		context->sfinfo.samplerate = 8000;
 	} else if (!strcmp(ext, "adpcm")) {
 		context->sfinfo.format = SF_FORMAT_WAV | SF_FORMAT_IMA_ADPCM;
 		context->sfinfo.channels = 1;
@@ -350,7 +354,7 @@ static switch_status_t setup_formats(void)
 	char buffer[128];
 	int format, major_count, subtype_count, m, s;
 	int len, x, skip;
-	char *extras[] = { "r8", "r16", "r24", "r32", "gsm", "ul", "ulaw", "al", "alaw", "adpcm", NULL };
+	char *extras[] = { "r8", "r16", "r24", "r32", "gsm", "ul", "ulaw", "al", "alaw", "adpcm", "vox", NULL };
 	int exlen = (sizeof(extras) / sizeof(extras[0]));
 	buffer[0] = 0;