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New Contributor II

908e fax issue disconnect

Adtran has been installed for years and two weeks ago, faxes through adtran fail.

Every once in awhile a few get through.

My customer only receives faxes.

the path is:  2 sip trunks > 908e > isdn > customer equipment > customer fax

I only have access to the 908e.

from the sip trunks going toward fax:

Sdp=  m=audio 10158 RTP/AVP 0 8 18 101

908 toward sip trunks:

m=audio 10004 RTP/AVP 18 101

but I don't get the re-invite for t.38

It looks like to me that we are receiving a disconnect from the isdn.

Does anyone know what the stuff in green bold is?

Thanks in advance.

debugs:

02:34:33:072 SB.CCM getFinalCodec:
G729

02:34:33:073 SB.CCM connect: Configuring RTP Channel 0/1.1
to x.x.x.x:63312 via G729

02:34:33:073 SB.CCM connect:     fpp=2 echo=on dtmf=101/101 dscp=46 vad=off

02:34:33:073 VOICE.SUMMARY RTP for Call from (10 digit #) to
(10 digit #):  Codec G729

02:34:33:074 RTP.CHANNEL Channel 0/1.1 session statistics
cleared.

02:34:33:074 RTP.CHANNEL Channel 0/1.1 started sucessfully.

02:34:33:074 SB.CCM connect: Starting RTP Channel

02:34:33:074 SB.CCM firewallConnectCall: No action taken,
firewall traversal is not enabled

02:34:33:075 SB.CALL 296794 State change      >> Connecting->Connected

02:34:33:075 VOICE.SUMMARY T02 is connected to T03
(10 digit #)

02:34:33:075 SB.CALL 296794 Connected            ConnectResponse sent from T02 to T03

02:34:33:075 RTP.CHANNEL t1 0/3.0.1 - dsp 0/1.1 - RTP:
starting

02:34:33:075 TA.T03 01 TAConnectWaitOut     ConnectResp event accepted

02:34:33:076 TA.T03 01 State change      >> TAConnectWaitOut->TAConnected
(TAS_Connected)

02:34:33:076 TM.T03 01
IsdnTmStateOutboundConnecting->IsdnTmStateOutboundConnected

02:34:33:076 TM.T03 01 IsdnTmStateOutboundConnected::enter()

02:34:38 ISDN.L2_MSG PRI
2  Sent  = 02 01 01 B3

02:34:38 ISDN.L2_MSG PRI
2  Recd  = 02 01 01 C9

02:34:42 ISDN.L2_MSG PRI
1  Sent  = 02 01 01 A7

02:34:42 ISDN.L2_MSG PRI
1  Recd  = 02 01 01 E5

02:34:48 ISDN.L2_MSG PRI
2  Sent  = 02 01 01 B3

02:34:48 ISDN.L2_MSG PRI
2  Recd  = 02 01 01 C9

02:34:52 ISDN.L2_MSG PRI
1  Sent  = 02 01 01 A7

02:34:52 ISDN.L2_MSG PRI
1  Recd  = 02 01 01 E5

02:34:58 ISDN.L2_MSG PRI
2  Sent  = 02 01 01 B3

02:34:58 ISDN.L2_MSG PRI
2  Recd  = 02 01 01 C9

02:34:59 ISDN.L2_MSG PRI
1  Recd  = 00 01 A6 E4 08 02 99 11 45 08 02 80 90

02:34:59 ISDN.L2_FMT PRI
1
=====================================================

02:34:59 ISDN.L2_FMT PRI
1  Recd = Sapi:00  C/R:R Tei:00

02:34:59 ISDN.L2_FMT PRI
1         Ctl:INFO     Ns:83 
Nr:114

02:34:59 ISDN.L2_FMT PRI
1         Prot:08  CRL:2  CRV:9911

02:34:59 ISDN.L2_FMT PRI
1         M - 45 DISCONNECT

02:34:59 ISDN.L2_FMT PRI
1          IE - 08 CAUSE               Len=2

02:34:59 ISDN.L2_FMT PRI
1               80 Location:U

02:34:59 ISDN.L2_FMT PRI
1               90 Cause:16
(NORMAL_CLEARING)

02:34:59 ISDN.L2_MSG PRI
1  Sent  = 00 01 01 A8

02:34:59 ISDN.CC_MSG PRI
1  CC>>Host: 02 993a
DISC_IND

02:34:59 ISDN.CC_IE
PRI  1     ie: 00 08 04 00 00 00 90

02:34:59 ISDN.EP   
PRI  1  Call to '(10 digit #)' Process clearing. CCR 16

02:34:59 ISDN.EP   
PRI  1  ProcessClearing:: Send clearCallEvt to
user  TM: 1

02:34:59 ISDN.CC_MSG PRI
1  Host>>CC: 02 993a
CLEAR_REQ

02:34:59 ISDN.CC_IE
PRI  1     ie: 00 08 04 00 00 00 90

02:34:59 ISDN.L2_MSG PRI
1  Sent  = 02 01 E4 A8 08 02 19 11 4D

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Honored Contributor
Honored Contributor

Re: 908e fax issue disconnect

The g.729 codec is compressed and doesn't support fax. Configure your codec for g.711, also consider adding "modem passthrough" to the configuration. Additional detail here: Configuring and Troubleshooting Fax and Modem Calls in AOS

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Contributor III
Contributor III

Re: 908e fax issue disconnect

Hello Micahel,

Did switching the codecs resolve the issue with faxing?

Thanks,

Geoff

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New Contributor II

Re: 908e fax issue disconnect

hello, this was working for 6 years and the configuration hasn't changed. the call is established via 729 and there should be a re-invite to t38. but the re-invite wasn't happening. I did change it to modem passthrough via the gui and disabled t38. faxes are working. thanks for your help.

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Contributor III
Contributor III

Re: 908e fax issue disconnect

Thanks for the feedback.  You definitely want modem-passthrough ON whenever you are faxing over a voice user or trunk.  Part of the green messages show the call being disconnected from the PRI point of view.  If you are ever needing to debug SIP to PRI, run these debugs:

debug sip stack message

debug isdn l2-for

debug voice verbose

This will show you all 3 call legs and you can get a better idea of why the call/fax fails.  If the ADTRAN config didn't change, maybe something in the network was upgraded/changed that altered the call flow.

Regards,

Geoff

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