Thank you George.

Using slin16 instead of generic slin resolved the issue.

Have a good day!
Dan


From: asterisk-users <asterisk-users-boun...@lists.digium.com> On Behalf Of 
George Joseph
Sent: Wednesday, October 13, 2021 8:22 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion 
<asterisk-users@lists.digium.com>
Subject: [External] Re: [asterisk-users] Question on ExternalMedia and the codec



On Tue, Oct 12, 2021 at 2:54 PM Dan Cropp 
<d...@amtelco.com<mailto:d...@amtelco.com>> wrote:
We tell asterisk to use the slin format for ExternalMedia.  However, the 
unicast channel is selecting ulaw formatand the RTP data is indicating it’s 
ulaw format.

Anyone know why ulaw format would be on chosen?

What do your ARI requests look like?  Are you just requesting "slin" or one of 
the specific variants?




[10/12 16:13:39.396] DEBUG[1665] http.c: HTTP Request URI is 
/ari/channels/externalMedia?app=a2519b4b-4d90-4d18-906b-717d02f8d569&external_host=192.168.32.148:8080&format=slin
[10/12 16:13:39.396] DEBUG[1665] http.c: match request 
[ari/channels/externalMedia] with handler [static] len 6
[10/12 16:13:39.396] DEBUG[1665] http.c: match request 
[ari/channels/externalMedia] with handler [ari] len 3
[10/12 16:13:39.396] DEBUG[1665] http.c: Match made with [ari]
[10/12 16:13:39.396] DEBUG[1665] res_ari.c: Finding handler for 
channels/externalMedia
[10/12 16:13:39.396] DEBUG[1665] res_ari.c:   Finding handler for channels
[10/12 16:13:39.396] DEBUG[1665] res_ari.c:         Checking ari deviceStates:  
Didn't match channels
[10/12 16:13:39.396] DEBUG[1665] res_ari.c:         Checking ari applications:  
Didn't match channels
[10/12 16:13:39.396] DEBUG[1665] res_ari.c:         Checking ari channels:  
Explicit match with channels
[10/12 16:13:39.396] DEBUG[1665] res_ari.c:   Finding handler for externalMedia
[10/12 16:13:39.396] DEBUG[1665] res_ari.c:         Checking channels create:  
Didn't match externalMedia
[10/12 16:13:39.396] DEBUG[1665] res_ari.c:         Checking channels 
channelId:  Matched wildcard.
[10/12 16:13:39.396] DEBUG[1665] res_ari.c:         Checking channels 
externalMedia:  Explicit match with externalMedia
[10/12 16:13:39.396] DEBUG[1665] acl.c: For destination '192.168.32.148', our 
source address is '192.168.33.34'.
[10/12 16:13:39.396] DEBUG[1665] rtp_engine.c: Using engine 'asterisk' for RTP 
instance '0x7fef60018320'
[10/12 16:13:39.396] DEBUG[1665] res_rtp_asterisk.c: (0x7fef60018320) RTP 
allocated port 12226
[10/12 16:13:39.396] DEBUG[1665] res_rtp_asterisk.c: (0x7fef60018320) ICE 
creating session 192.168.33.34:12226<http://192.168.33.34:12226> (12226)
[10/12 16:13:39.396] DEBUG[1665] res_rtp_asterisk.c: (0x7fef60018320) ICE create
[10/12 16:13:39.396] DEBUG[1665] res_rtp_asterisk.c: (0x7fef60018320) ICE add 
system candidates
[10/12 16:13:39.396] DEBUG[1665] res_rtp_asterisk.c: (0x7fef60018320) ICE add 
candidate: 192.168.33.34:12226<http://192.168.33.34:12226>, 2130706431
[10/12 16:13:39.396] DEBUG[1665] rtp_engine.c: RTP instance '0x7fef60018320' is 
setup and ready to go
[10/12 16:13:39.396] DEBUG[1665] channel_internal_api.c:  <initializing>: 
Formats: (none)
[10/12 16:13:39.396] DEBUG[1665] channel_internal_api.c:  Channel is being 
initialized or destroyed
[10/12 16:13:39.396] DEBUG[1665] stasis.c: Creating topic. name: 
channel:1634055219.4, detail:
[10/12 16:13:39.396] DEBUG[1665] stasis.c: Topic 'channel:1634055219.4': 
0x7fef6008d170 created
[10/12 16:13:39.396] DEBUG[1665] channel.c: Channel 0x7fef6008a910 
'UnicastRTP/192.168.32.148:8080-0x7fef60018320' allocated
[10/12 16:13:39.396] DEBUG[1665] acl.c: For destination '192.168.32.148', our 
source address is '192.168.33.34'.
[10/12 16:13:39.396] DEBUG[1665] channel_internal_api.c:  
UnicastRTP/192.168.32.148:8080-0x7fef60018320: Formats: (ulaw)
[10/12 16:13:39.396] DEBUG[1665] channel_internal_api.c:  New topology set
[10/12 16:13:39.396] DEBUG[1665] res_stasis.c: 
a2519b4b-4d90-4d18-906b-717d02f8d569: Subscribing to 1634055219.4
[10/12 16:13:39.396] DEBUG[1665] stasis/app.c: Channel '1634055219.4' is 1 
interested in a2519b4b-4d90-4d18-906b-717d02f8d569
[10/12 16:13:39.396] DEBUG[1665] http.c: HTTP keeping session open.  
status_code:200
[10/12 16:13:39.396] DEBUG[1666] stasis/app.c: Channel '1634055219.4' is 2 
interested in a2519b4b-4d90-4d18-906b-717d02f8d569

Have a good day!
Dan

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