TT#64050 add `G729a` as an incorrect alternative to `G729`

Workaround for a bug in certain phones

Change-Id: I3203ce9d1992146c38b826dd96a962e6673915c7

lib/codeclib.c

@@ -178,6 +178,17 @@ static codec_def_t __codec_defs[] = {
 		.media_type = MT_AUDIO,
 		.codec_type = &codec_type_avcodec,
 	},
+	{
+		.rtpname = "G729a",
+		.avcodec_id = AV_CODEC_ID_G729,
+		.clockrate_mult = 1,
+		.default_clockrate = 8000,
+		.default_channels = 1,
+		.default_ptime = 20,
+		.packetizer = packetizer_passthrough,
+		.media_type = MT_AUDIO,
+		.codec_type = &codec_type_avcodec,
+	},
 #else
 	{
 		.rtpname = "G729",
@@ -191,6 +202,18 @@ static codec_def_t __codec_defs[] = {
 		.media_type = MT_AUDIO,
 		.codec_type = &codec_type_bcg729,
 	},
+	{
+		.rtpname = "G729a",
+		.avcodec_id = -1,
+		.clockrate_mult = 1,
+		.default_clockrate = 8000,
+		.default_channels = 1,
+		.default_ptime = 20,
+		.packetizer = packetizer_g729,
+		.bits_per_sample = 1, // 10 ms frame has 80 samples and encodes as (max) 10 bytes = 80 bits
+		.media_type = MT_AUDIO,
+		.codec_type = &codec_type_bcg729,
+	},
 #endif
 	{
 		.rtpname = "speex",