[asterisk-users] ISDN2#02: too much voice to send for NCCI=0x40502

[John Hughes]

My problem:

Sometimes the sound seems to cut on calls in progress.  We (on our local
SIP phones, Thomson ST2030's) can't hear the remote caller.  The caller
may hear some kind of horrid "sklurk" and then it goes dead for them too.

Our Asterisk is connected to the France Telecom network by an Eicon Diva
Server 4xBRI (we have 3 BRI lines).

Here's what I've found by turning on huge amounts of debug stuff:
everything runs just tickety-boo until the remote end seems to stop
sending us packets, our packets seem not to be sent and we get the
infamous "too much voice to send" error.

Help!  What might be going on?

Here's an example:

[ All is well: ]

Got  RTP packet from    192.168.6.185:41000 (type 08, seq 018498, ts 1479920, len 000080)
Got  RTP packet from    192.168.6.185:41000 (type 08, seq 018499, ts 1480000, len 000080)
DATA_B3_REQ ID=002 #0xee37 LEN=0030
  Controller/PLCI/NCCI            = 0x40502
  Data32                          = 0x0
  DataLength                      = 0xa0
  DataHandle                      = 0xb624
  Flags                           = 0x0
  Data64                          = 0x82fa70

DATA_B3_CONF ID=002 #0xee37 LEN=0016
  Controller/PLCI/NCCI            = 0x40502
  DataHandle                      = 0xb624
  Info                            = 0x0

DATA_B3_IND ID=002 #0x8a51 LEN=0030
  Controller/PLCI/NCCI            = 0x40502
  Data32                          = 0x0
  DataLength                      = 0xa0
  DataHandle                      = 0x49
  Flags                           = 0x0
  Data64                          = 0x2aaac7caa49e

DATA_B3_RESP ID=002 #0x8a51 LEN=0014
  Controller/PLCI/NCCI            = 0x40502
  DataHandle                      = 0x49

    -- ISDN2#02: DATA_B3_IND (len=160) fr.datalen=160 fr.subclass=8
Sent RTP packet to      192.168.6.185:41000 (type 08, seq 064338, ts 1428080, len 000160)

[ but at this point we seem to stop getting data from the network.  We
continue to send: ]

Got  RTP packet from    192.168.6.185:41000 (type 08, seq 018500, ts 1480080, len 000080)
Got  RTP packet from    192.168.6.185:41000 (type 08, seq 018501, ts 1480160, len 000080)
DATA_B3_REQ ID=002 #0xee39 LEN=0030
  Controller/PLCI/NCCI            = 0x40502
  Data32                          = 0x0
  DataLength                      = 0xa0
  DataHandle                      = 0xb625
  Flags                           = 0x0
  Data64                          = 0x82fb50

DATA_B3_CONF ID=002 #0xee39 LEN=0016
  Controller/PLCI/NCCI            = 0x40502
  DataHandle                      = 0xb625
  Info                            = 0x0

[... 8 RTP packets, 4 DATA_B3_REQ's omitted ]

[ And then: ]

Got  RTP packet from    192.168.6.185:41000 (type 08, seq 018510, ts 1480880, len 000080)
Got  RTP packet from    192.168.6.185:41000 (type 08, seq 018511, ts 1480960, len 000080)
       > ISDN2#02: too much voice to send for NCCI=0x40502
Got  RTP packet from    192.168.6.185:41000 (type 08, seq 018512, ts 1481040, len 000080)
Got  RTP packet from    192.168.6.185:41000 (type 08, seq 018513, ts 1481120, len 000080)
       > ISDN2#02: too much voice to send for NCCI=0x40502

[... Someone gets fed up and cuts the B channel: ]

Got  RTP packet from    192.168.6.185:41000 (type 08, seq 018610, ts 1488880, len 000080)
Got  RTP packet from    192.168.6.185:41000 (type 08, seq 018611, ts 1488960, len 000080)
       > ISDN2#02: too much voice to send for NCCI=0x40502
DISCONNECT_B3_IND ID=002 #0x8a8a LEN=0015
  Controller/PLCI/NCCI            = 0x40502
  Reason_B3                       = 0x0
  NCPI                            = default

DISCONNECT_B3_RESP ID=002 #0x8a8a LEN=0012
  Controller/PLCI/NCCI            = 0x40502

End of conversation.