3 thoughts on - Any Idea What Causes “Oooh, Got A Frame With Format Of G729 On Channel ‘PJSIP/121-000001d2’ When We’re Sending ‘ulaw’, Switching To Match”

• I’m reaching out to the asterisk users e-mail list in hopes someone there can provide guidance. A couple of Digium’s developers check this e-mail group so they may respond. Unfortunately, they are basically in the get ready for show mode. Major show is next week and they are also releasing the next major version in a matter of days.

  Asking if them… What causes asterisk to output the Oooh, got a frame with format of g729 on channel ‘PJSIP/121-000001d2’ when we’re sending ‘ulaw’, switching to match message?
  Is it asterisk detecting rtp stream with g729?
  Why would asterisk change to g729 stream if the codec negotiation is clearly ulaw in the SIP packets?

  Dan Cropp Senior Software Engineer, R&D Software Dept. AMTELCO, 4800 Curtin Drive, McFarland, WI 53558-9424
  608 838-4197 ext. 291
  1-800-238-5275 ext 291
  http://www.amtelco.com<http://www.amtelco.com/>

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  From: Dan Cropp Sent: Wednesday, October 3, 2018 1:57 PM
  To: asterisk-users@lists.digium.com Subject: Any idea what causes “Oooh, got a frame with format of g729 on channel ‘PJSIP/121-000001d2’ when we’re sending ‘ulaw’, switching to match”

  The PJSIP endpoint is configured for ulaw only. Not sure how or why we are seeing the g729 on calls for this endpoint.

  Would this be a case that asterisk detects the rtp stream is g729 even though it’s negotiated as ulaw?
  Why would asterisk change the format to g729 when disallow = all and allow = ulaw are the endpoint settings?

  [121]
  type = endpoint context = IS
  transport = transport1
  aors = 121
  accountcode = 2
  dtmf_mode = inband device_state_busy_at = 96
  force_rport = no identify_by = username,ip disallow = all allow = ulaw from_user = 121
  acl = acl1

  [10/03 11:29:34.240] DEBUG[21414][C-00000226] chan_pjsip.c: Oooh, got a frame with format of g729 on channel ‘PJSIP/121-000001d2’ when we’re sending ‘ulaw’, switching to match

  INVITE sip:2197@XXX.XXX.XXX.XXX:5060 SIP/2.0
  Via: SIP/2.0/UDP YYY.YYY.YYY.YYY:5060;branch=z9hG4bKxqyYl2Jg84158000
  To: >
  From: >;tag=I0n4X7KK
  Contact: >
  Call-ID: OlrmFuyOq-0000-@ YYY.YYY.YYY.YYY
  CSeq: 2223 INVITE
  Max-Forwards: 70
  Allow: INVITE,ACK,CANCEL,BYE,OPTIONS,REFER,NOTIFY
  Supported: replaces Content-Type: application/sdp Content-Length: 335

  v=0
  o=- 11264000 11264000 IN IP4 YYY.YYY.YYY.YYY
  s=-
  c=IN IP4 192.168.10.213
  t=0 0
  m=audio 32768 RTP/AVP 0 2 8 18 110 120 100
  a=rtpmap:0 PCMU/8000
  a=rtpmap:2 G726-32/8000
  a=rtpmap:8 PCMA/8000
  a=rtpmap:18 G729/8000
  a=rtpmap:110 G723/5300
  a=rtpmap:120 G723/6300
  a=rtpmap:100 telephone-event/8000
  a=fmtp:100 0-15
  a=sendrecv

  Send SIP/2.0 200 OK
  Via: SIP/2.0/UDP YYY.YYY.YYY.YYY:5060;received=YYY.YYY.YYY.YYY;branch=z9hG4bKxqyYl2Jg84158000
  Call-ID: OlrmFuyOq-0000-@YYY.YYY.YYY.YYY
  From: ;tag=I0n4X7KK
  To: >;tag=b4134118-08f4-4dbc-a145-573d04438092
  CSeq: 2223 INVITE
  Server: Asterisk PBX 13.20.0
  Allow: OPTIONS, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, REGISTER, REFER, MESSAGE
  Contact:
  Supported: 100rel, timer, replaces, norefersub Content-Type: application/sdp Content-Length: 181

  v=0
  o=- 11264000 11264002 IN IP4 YYY.YYY.YYY.YYY
  s=Asterisk c=IN IP4 192.168.11.176
  t=0 0
  m=audio 18380 RTP/AVP 0
  a=rtpmap:0 PCMU/8000
  a=ptime:20
  a=maxptime:150
  a=sendrecv

  Receive ACK sip:XXX.XXX.XXX.XXX:5060 SIP/2.0
  Via: SIP/2.0/UDP YYY.YYY.YYY.YYY:5060;branch=z9hG4bKCIJuiRuH8415a000
  To: >;tag=b4134118-08f4-4dbc-a145-573d04438092
  From: >;tag=I0n4X7KK
  Max-Forwards: 70
  Call-ID: OlrmFuyOq-0000-@YYY.YYY.YYY.YYY
  CSeq: 2223 ACK

  Asterisk debugging outputs the following.
  [10/03 11:29:34.240] DEBUG[21414][C-00000226] chan_pjsip.c: Oooh, got a frame with format of g729 on channel ‘PJSIP/121-000001d2’ when we’re sending ‘ulaw’, switching to match
  [10/03 11:29:34.240] DEBUG[21414][C-00000226] channel.c: Channel PJSIP/121-000001d2 setting write format path: ulaw -> g729
  [10/03 11:29:34.240] DEBUG[21414][C-00000226] channel.c: Channel PJSIP/121-000001d2 setting read format path: ulaw -> g729
  [10/03 11:29:34.240] DEBUG[21414][C-00000226] channel.c: Channel PJSIP/121-000001d2 setting read format path: g729 -> g729

• Because Asterisk received a G729 RTP packet from the other side and is being accommodating because asymmetric_rtp_codec=no is set. In this case the other side is in error by not honoring the negotiation.

  This is mostly historical. chan_sip didn’t keep track of the truly negotiated codecs in the channel’s native capabilities. So if the peer’s INVITE
  asked for five codecs and Asterisk supported three of them, we would respond with the three and then pick the one we were going to use and put it into the channel’s native capabilities. chan_pjsip has the asymmetric_rtp_codec option to emulate this same behavior which results in the “Oooh”
  message you are seeing. If that option were disabled we would put those three codecs in the channel’s native capabilities. Then you would get this debug message instead:
  “Oooh, got a frame with format of %s on channel ‘%s’ when it has not been negotiated”
  and the frame would be discarded.

  The primary reason for chan_sip’s behavior and chan_pjsip’s asymmetric_rtp_codec=no option is because phone DSP’s can only handle a single codec at a time. Technically if the peer’s INVITE offered five and we responded with three the peer should immediately renegotiate to narrow the codec choice to one.

  Richard

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