FXO/T38 Fax relay issue on a CCM-controlled MGCP gateway - RigthFax9.4

tka · ‎02-16-2010

Hello,

I set up a Right fax server 9.4. Evry thing is working fine using a PRI link.

However, when I tried to configure FXO analog lines to accept and forward T38 faxes, I wasn't able to make things work. There is no fax tone heard when calling the analog line connected to an FXO installed on a CCM-controlled 2811 MGCP gateway.

I have added the following line to the gateway config :

no mgcp fax t38 inhibit

mgcp package-capability fxr-package

mgcp default-package fxr-package

I noted that the call succed to reach the fax server ( using the Fax Entreprise Manager ).

However thre is no fax tone detected and there is no successful fax transmission !

When I type show voice call summary during a fax call , I note

"T38" written in the CODEC column whereas it should the rate used (14400) and VSTP column contains S_CONNECT instead of S_FAX

The gateway end point and the RF gateway are also in the same Device Pool

Is there any suggestions to solve this ?

Thanks in advance

William Bell · ‎02-24-2010

Actually, using the command show voice call summary, I think that having t38 in the CODEC column is correct. However, I agree that the VTSP column should say S_FAX instead of S_CONNECT. Now with a t38 fax, you will see 14400 in the CODEC column if you use the 'show voice call status'.

For example:

iecucme01#sho voice call summary
PORT           CODEC     VAD VTSP STATE            VPM STATE
============== ========= === ==================== ======================

0/3/0:23.23     t38        n S_FAX
0/1/0                                            *shutdown*
0/1/1         -          - -                     FXSLS_ONHOOK

iecucme01#sho voice call status
CallID CID ccVdb Port Slot/DSP:Ch Called # Codec MLPP Dial-peers
0x55 120B 0x48BED9FC 0/3/0:23.23 0/1:1 * 14400 0/0
1 active call found

iecucme01#sho call active voice compact
A/O FAX T Codec type Peer Address IP R:
Total call-legs: 1
88 ORG FAX T45 t38 VOIP P 10.3.254.2:17040

That being said. Which version of IOS are you running? There is a defect in the 12.4T train that I have ran into. The defect ID is CSCsy29533. It affected some 12.4(15)T trains and is fixed in 12.4(15)T12. It is also fixed in 12.4(24)T2 and I believe 12.4(20)T4. Though, there are some other defects in 12.4(20)T4 that I wanted to avoid so I did not test that version. I have tested and confirmed the defect in 12.4(20)T and 12.4(20)T4. I have also tested that it is fixed in 12.4(24)T2. Anyway, it is at least something to check. The bug is well written and you can confirm you are impacted almost immediately.

HTH.

Regards,
Bill

Please remember to rate helpful posts.

HTH -Bill (b) http://ucguerrilla.com (t) @ucguerrilla

Please remember to rate helpful responses and identify

lwai · ‎05-20-2010

Hi Friend,

I face the same issue in CM 6.1(3), Did you solve this issue? What IOS helps to solve this issue?

My voice gateway use 12.4(16b) version, as the incoming call answer by FAX server, no sound .Debug isdn q931 indicate the call clear normally.

Debug mgcp packet indicate t38 start

Please share your experience in this subject, thanks!!

debug pasket:

v=0

c=IN IP4 172.21.1.240

m=audio 18226 RTP/AVP 0 100

a=rtpmap:100 X-NSE/8000

a=fmtp:100 192-194,200-202

a=X-sqn:0

a=X-cap: 1 audio RTP/AVP 100

a=X-cpar: a=rtpmap:100 X-NSE/8000

a=X-cpar: a=fmtp:100 192-194,200-202

a=X-cap: 2 image udptl t38

<---

Hostel-R7-V2#

003349: *May 19 16:03:49.721: MGCP Packet received from 172.17.7.244:2427--->

MDCX 6160400 S0/SU0/DS1-1/23@Hostel-R7-V2 MGCP 0.1

C: D00000000257cb71000000F500000006

I: 16

X: 17

L: p:20, a:PCMU, s:off, t:b8, fxr/fx:t38

M: sendrecv

R: D/[0-9ABCD*#], FXR/t38

S:

Q: process,loop

v=0

o=- 22 0 IN EPN S0/SU0/DS1-1/23@Hostel-R7-V2

s=Cisco SDP 0

t=0 0

m=audio 17560 RTP/AVP 0

c=IN IP4 172.21.1.202

a=X-sqn:0

a=X-cap:1 image udptl t38

<---

003350: *May 19 16:03:49.725: MGCP Packet sent to 172.17.7.244:2427--->

200 6160400 OK

<---

Hostel-R7-V2#

003351: *May 19 16:03:55.725: MGCP Packet sent to 172.17.7.244:2427--->

NTFY 63132756 S0/SU0/DS1-1/23@Hostel-R7-V2 MGCP 0.1

N: ca@172.17.7.244:2427

X: 17

O: FXR/t38(start)

<---

003352: *May 19 16:03:55.725: MGCP Packet received from 172.17.7.244:2427--->

200 63132756

<---

Hostel-R7-V2#

003353: *May 19 16:04:07.885: MGCP Packet sent to 172.17.7.244:2427--->

NTFY 63132757 *@Hostel-R7-V2 MGCP 0.1

X: 0

O:

<---

003354: *May 19 16:04:07.885: MGCP Packet received from 172.17.7.244:2427--->

200 63132757

<---

Hostel-R7-V2#

003355: *May 19 16:04:22.885: MGCP Packet sent to 172.17.7.244:2427--->

NTFY 63132758 *@Hostel-R7-V2 MGCP 0.1

X: 0

O:

<---

003356: *May 19 16:04:22.885: MGCP Packet received from 172.17.7.244:2427--->

200 63132758

<---

Hostel-R7-V2#

003357: *May 19 16:04:33.589: MGCP Packet received from 172.17.7.244:2427--->

DLCX 6160401 S0/SU0/DS1-1/23@Hostel-R7-V2 MGCP 0.1

C: D00000000257cb71000000F500000006

I: 16

X: 17

S:

<---

003358: *May 19 16:04:33.597: MGCP Packet sent to 172.17.7.244:2427--->

250 6160401 OK

P: PS=2201, OS=350756, PR=300, OR=48000, PL=0, JI=3, LA=1

<---

003359: *May 19 16:04:34.053: MGCP Packet received from 172.17.7.244:2427--->

CRCX 6160402 S0/SU0/DS1-0/17@Hostel-R7-V2 MGCP 0.1

C: D000000003aa471d000000F580000001

X: 11

L: p:20, a:PCMU, s:off, t:b8, fxr/fx:t38

M: recvonly

R: D/[0-9ABCD*#]

Q: process,loop

<---

003360: *May 19 16:04:34.061: MGCP Packet sent to 172.17.7.244:2427--->

Hostel-R7-V2#200 6160402 OK

I: 17

v=0

c=IN IP4 172.21.1.240

m=audio 18846 RTP/AVP 0 100

a=rtpmap:100 X-NSE/8000

a=fmtp:100 192-194,200-202

a=X-sqn:0

a=X-cap: 1 audio RTP/AVP 100

a=X-cpar: a=rtpmap:100 X-NSE/8000

a=X-cpar: a=fmtp:100 192-194,200-202

a=X-cap: 2 image udptl t38

<---

003361: *May 19 16:04:34.061: MGCP Packet received from 172.17.7.244:2427--->

RQNT 6160403 S0/SU0/DS1-0/17@Hostel-R7-V2 MGCP 0.1

X: 11

R: D/[0-9ABCD*#]

S: G/rt

Q: process,loop

<---

003362: *May 19 16:04:34.065: MGCP Packet sent to 172.17.7.244:2427--->

200 6160403 OK

<---

Hostel-R7-V2#

003363: *May 19 16:04:42.957: MGCP Packet received from 172.17.7.244:2427--->

CRCX 6160404 S0/SU0/DS1-1/23@Hostel-R7-V2 MGCP 0.1

C: D000000003aa4721000000F500000007

X: 17

L: p:20, a:PCMU, s:off, t:b8, fxr/fx:t38

M: recvonly

R: D/[0-9ABCD*#]

Q: process,loop

<---

003364: *May 19 16:04:42.965: MGCP Packet sent to 172.17.7.244:2427--->

200 6160404 OK

I: 18

v=0

c=IN IP4 172.21.1.240

m=audio 18982 RTP/AVP 0 100

a=rtpmap:100 X-NSE/8000

a=fmtp:100 192-194,200-202

a=X-sqn:0

a=X-cap: 1 audio RTP/AVP 100

a=X-cpar: a=rtpmap:100 X-NSE/8000

a=X-cpar: a=fmtp:100 192-194,200-202

a=X-cap: 2 image udptl t38

<---

Hostel-R7-V2#

003365: *May 19 16:04:43.773: MGCP Packet received from 172.17.7.244:2427--->

MDCX 6160405 S0/SU0/DS1-1/23@Hostel-R7-V2 MGCP 0.1

C: D000000003aa4721000000F500000007

I: 18

X: 17

L: p:20, a:PCMU, s:off, t:b8, fxr/fx:t38

M: sendrecv

R: D/[0-9ABCD*#], FXR/t38

S:

Q: process,loop

v=0

o=- 24 0 IN EPN S0/SU0/DS1-1/23@Hostel-R7-V2

s=Cisco SDP 0

t=0 0

m=audio 28054 RTP/AVP 0

c=IN IP4 172.16.28.197

a=X-sqn:0

a=X-cap:1 image udptl t38

<---

003366: *May 19 16:04:43.777: MGCP Packet sent to 172.17.7.244:2427--->

200 6160405 OK

<---

Hostel-R7-V2#

003367: *May 19 16:04:50.317: MGCP Packet received from 172.17.7.244:2427--->

MDCX 6160406 S0/SU0/DS1-0/17@Hostel-R7-V2 MGCP 0.1

C: D000000003aa471d000000F580000001

I: 17

X: 11

L: p:20, a:PCMU, s:off, t:b8, fxr/fx:t38

M: sendrecv

R: D/[0-9ABCD*#], FXR/t38

S:

Q: process,loop

v=0

o=- 23 0 IN EPN S0/SU0/DS1-0/17@Hostel-R7-V2

s=Cisco SDP 0

t=0 0

m=audio 24970 RTP/AVP 0

c=IN IP4 172.21.1.231

a=X-sqn:0

a=X-cap:1 image udptl t38

<---

003368: *May 19 16:04:50.325: MGCP Packet sent to 172.17.7.244:2427--->

200 6160406 OK

<---

Hostel-R7-V2#

003369: *May 19 16:04:52.901: MGCP Packet received from 172.17.7.244:2427--->

AUEP 6160407 S0/SU0/DS1-0/1@Hostel-R7-V2 MGCP 0.1

F: X

<---

Michael