[Freeswitch-users] LIN16 at 16000h Freeswitch <-> Asterisk

[Antonio Eugenio Burriel]

Hi,

I've a FXO running Asterisk 1.8.32.1 registered to Freeswitch
1.4.15~1-1~wheezy+1.
Majority of codecs (G722, ALAW, GSM, etc) work well, except for
LIN16 at 16000h (SLIN16 in Asterisk).

LIN16 at 8000h works great:
v=0
o=root 739945760 739945761 IN IP4 192.168.1.2
s=Asterisk PBX 1.8.32.1
c=IN IP4 192.168.1.2
t=0 0
m=audio 18760 RTP/AVP 10 101
a=rtpmap:10 L16/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20

2015-02-08 17:49:01.525330 [DEBUG] switch_core_media.c:3627 Audio
Codec Compare [L16:10:8000:20:0:1]/[L16:70:8000:20:128000:1]
2015-02-08 17:49:01.525330 [DEBUG] switch_core_media.c:3682 Audio
Codec Compare [L16:70:8000:20:128000:1] ++++ is saved as a match
2015-02-08 17:49:01.525330 [DEBUG] switch_core_media.c:3627 Audio
Codec Compare [L16:10:8000:20:0:1]/[G722:9:8000:20:64000:1]
2015-02-08 17:49:01.525330 [DEBUG] switch_core_media.c:3627 Audio
Codec Compare [L16:10:8000:20:0:1]/[PCMA:8:8000:20:64000:1]


But with LIN16 at 16000h codec can't be matched, even being on Freeswitch
allowed list!:
v=0
o=root 202962363 202962364 IN IP4 192.168.1.2
s=Asterisk PBX 1.8.32.1
c=IN IP4 192.168.1.2
t=0 0
m=audio 13330 RTP/AVP 118 3 0 8 101
a=rtpmap:118 L16/16000
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20

2015-02-08 15:53:13.645340 [DEBUG] switch_core_media.c:3627 Audio
Codec Compare [L16:118:16000:20:0:1]/[L16:70:16000:20:256000:1]
2015-02-08 15:53:13.645340 [DEBUG] switch_core_media.c:3627 Audio
Codec Compare [GSM:3:8000:20:13200:1]/[L16:70:16000:20:256000:1]
2015-02-08 15:53:13.645340 [DEBUG] switch_core_media.c:3627 Audio
Codec Compare [PCMU:0:8000:20:64000:1]/[L16:70:16000:20:256000:1]
2015-02-08 15:53:13.645340 [DEBUG] switch_core_media.c:3627 Audio
Codec Compare [PCMA:8:8000:20:64000:1]/[L16:70:16000:20:256000:1]


With a ptime of 20ms, packet size is well below my MTU.
Any hints?