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DTMF doesn't work on external IVR application


Art King
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We have an external application that does IVR functions via SIP. It works fine when we access it directly from an AudioCodes gateway. I want to be able to make a call through PBXNSIP to my external SIP application.

 

I setup a new Trunk on the PBXNSIP and I configured a Dialplan to send calls to the external IVR. I can make a call from the PBX to the to the external IVR and the IVR application answers, and the audio comes through fine. However, I cannot get my application to recognize DTMF from snom telephone, or from a softphone.

 

DTMF entries interrupt the voice prompts on the IVR system as they are supposed to. The IVR script is looking for four digits, and it accepts four digits correctly. However, the IVR log, shows it received the DTMF digits of ?5555? when what I entered was "5353"

 

In all my testing, it seems like whatever the first DTMF digit I enter, this digit is repeated for all the digits requested. So if I enter ?1234? the debug shows ?1111?

 

I changed the setting on PBXNSIP to allow ?Inband DTMF Detection? but it made no difference. I get different results when calling from the snom phone vs the X-Lite softphone, but I never have gotten it to work in any case.

 

Below is a section of the log showing the DTMF passing across to the external IVR from an X-Lite softphone.

 

Troubleshooting suggestions would be appreciated!

 

Art

 

The log below is from PBXNSIP

 

The softphone making the call is at IP address 10.0.0.85

The PBXNSIP is at IP address 10.0.0.22

The external IVR is at 10.0.0.205

 

INVITE sip:321@10.0.0.22 SIP/2.0

Via: SIP/2.0/UDP 10.0.0.85:37272;branch=z9hG4bK-d87543-ca578d2d81468133-1--d87543-;rport

Max-Forwards: 70

Contact: <sip:5353@10.0.0.85:37272>

To: "321"<sip:321@10.0.0.22>

From: "Art King (soft)"<sip:5353@10.0.0.22>;tag=2405ad3c

Call-ID: ZTk4MDUxN2VlYzkyMTM5ZTk3YmIwNzg5OGQ5NzNkZDM.

CSeq: 1 INVITE

Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO

Content-Type: application/sdp

User-Agent: X-Lite release 1006e stamp 34025

Content-Length: 316

 

v=0

o=- 5 2 IN IP4 10.0.0.85

s=CounterPath X-Lite 3.0

c=IN IP4 10.0.0.85

t=0 0

m=audio 61172 RTP/AVP 107 119 0 98 8 3 101

a=alt:1 1 : X+KZtdhy XCvsEoGu 10.0.0.85 61172

a=fmtp:101 0-15

a=rtpmap:107 BV32/16000

a=rtpmap:119 BV32-FEC/16000

a=rtpmap:98 iLBC/8000

a=rtpmap:101 telephone-event/8000

a=sendrecv

UDP: Opening socket on port 53760

UDP: Opening socket on port 53761

Identify trunk 6

Resolve destination 50438: a udp 10.0.0.85 37272

Resolve destination 50438: udp 10.0.0.85 37272

Send Packet 100

SIP Tx udp:10.0.0.85:37272:

SIP/2.0 100 Trying

Via: SIP/2.0/UDP 10.0.0.85:37272;branch=z9hG4bK-d87543-ca578d2d81468133-1--d87543-;rport=37272

From: "Art King (soft)" <sip:5353@10.0.0.22>;tag=2405ad3c

To: "321" <sip:321@10.0.0.22>;tag=3151257388

Call-ID: ZTk4MDUxN2VlYzkyMTM5ZTk3YmIwNzg5OGQ5NzNkZDM.

CSeq: 1 INVITE

Content-Length: 0

Sending RTP to 10.0.0.85:61172

Resolve destination 50439: url sip:5353@10.0.0.122

 

Resolve destination 50439: udp 10.0.0.122 5060

Send Packet NOTIFY

Dialplan: Match 321@10.0.0.22 to <sip:321@10.0.0.205;user=phone> on trunk ExtIVR

Play audio_moh/noise.wav

UDP: Opening socket on port 51638

UDP: Opening socket on port 51639

Resolve destination 50440: url sip:10.0.0.205

 

Resolve destination 50440: udp 10.0.0.205 5060

Send Packet INVITE

SIP Tx udp:10.0.0.205:5060:

INVITE sip:321@10.0.0.205;user=phone SIP/2.0

Via: SIP/2.0/UDP 10.0.0.22:5060;branch=z9hG4bK-47c500d1bc1c4e59da4c9db28bd275a3;rport

From: "ExtIVR" <sip:10.0.0.205>;tag=46519

To: <sip:321@10.0.0.205;user=phone>

Call-ID: 29cca7cd@pbx

CSeq: 29522 INVITE

Max-Forwards: 70

Contact: <sip:10.0.0.22:5060;transport=udp>

Supported: 100rel, replaces, norefersub

Allow-Events: refer

Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, PRACK, INFO, PUBLISH, NOTIFY, SUBSCRIBE, MESSAGE

Accept: application/sdp

User-Agent: pbxnsip-PBX/2.0.3.1715

Content-Type: application/sdp

Content-Length: 286

 

v=0

o=- 26774 26774 IN IP4 10.0.0.22

s=-

c=IN IP4 10.0.0.22

t=0 0

m=audio 51638 RTP/AVP 0 8 18 2 3 101

a=rtpmap:0 pcmu/8000

a=rtpmap:8 pcma/8000

a=rtpmap:18 g729/8000

a=rtpmap:2 g726-32/8000

a=rtpmap:3 gsm/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-11

a=sendrecv

Resolve destination 50441: a udp 10.0.0.85 37272

Resolve destination 50441: udp 10.0.0.85 37272

Send Packet 183

SIP Tx udp:10.0.0.85:37272:

SIP/2.0 183 Session Progress

Via: SIP/2.0/UDP 10.0.0.85:37272;branch=z9hG4bK-d87543-ca578d2d81468133-1--d87543-;rport=37272

From: "Art King (soft)" <sip:5353@10.0.0.22>;tag=2405ad3c

To: "321" <sip:321@10.0.0.22>;tag=3151257388

Call-ID: ZTk4MDUxN2VlYzkyMTM5ZTk3YmIwNzg5OGQ5NzNkZDM.

CSeq: 1 INVITE

Contact: <sip:5353@10.0.0.22:5060>

Supported: 100rel, replaces, norefersub

Allow-Events: refer

Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, PRACK, INFO, PUBLISH, NOTIFY, SUBSCRIBE, MESSAGE

Accept: application/sdp

User-Agent: pbxnsip-PBX/2.0.3.1715

Content-Type: application/sdp

Content-Length: 186

 

v=0

o=- 10805 10805 IN IP4 10.0.0.22

s=-

c=IN IP4 10.0.0.22

t=0 0

m=audio 53760 RTP/AVP 0 101

a=rtpmap:0 pcmu/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-11

a=sendrecv

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