Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

T38 fax relay between H.323 and MGCP gateways

Hi,

We have got a 1760 H.323 voice gateway with BRI interface connected to a fax server. We also have a VG224 configured for MGCP. Both gateways are configured for T38 fax relay. When we try to place a fax call from VG224 to the fax server via BRI interface the call fails. The "debug fax relay t30 all" shows the following:

BRI H.323 -

*Oct 10 01:05:26.541: %ISDN-6-CONNECT: Interface BRI0/1:1 is now connected to 00

76 N/A

*Oct 10 01:05:29.954: 0/1 (251) 1665848486 fr-entered=10(ms)

*Oct 10 01:05:30.074: 0/1 (251) 1665848600 fr-pkt-loss 9

*Oct 10 01:05:30.227: 0/1 (251) 1665848750 fr-pkt-loss 9

timestamp=1665849400 fr-msg-det CSI

timestamp=1665850090 fr-msg-det DIS

timestamp=1665854770 fr-msg-det CSI

timestamp=1665855460 fr-msg-det DIS

timestamp=1665860140 fr-msg-det CSI

timestamp=1665860830 fr-msg-det DIS

timestamp=1665865510 fr-msg-det CSI

timestamp=1665866200 fr-msg-det DIS

timestamp=1665870870 fr-msg-det CSI

timestamp=1665871560 fr-msg-det DIS

timestamp=1665876190 fr-msg-det CSI

timestamp=1665876880 fr-msg-det DIS

timestamp=1665881530 fr-msg-det CSI

timestamp=1665882220 fr-msg-det DIS

*Oct 10 01:06:08.353: %ISDN-6-DISCONNECT: Interface BRI0/1:1 disconnected from

0076 , call lasted 41 seconds

VG224 MGCP -

*Mar 22 03:44:42.234: %SYS-5-CONFIG_I: Configured from console by vty0 (10.210.10.8)

*Mar 22 03:45:17.854: //675/0AF8035683B3/CCAPI/cc_api_inband_msg_received:

Payload=100, Event=200, Interface=0x6272C76C, Call Id=675

*Mar 22 03:45:17.942: 2/3 (675) 1824523096 fr-entered=10(ms)

*Mar 22 03:45:19.094: 2/3 (675) timestamp=1824524246 fr-msg-tx CSI

*Mar 22 03:45:19.782: 2/3 (675) timestamp=1824524936 fr-msg-tx DIS

*Mar 22 03:45:20.034: 2/3 (675) timestamp=1824525186 FR_BAD_CRC_LS_DATA 0x0 bytes

*Mar 22 03:45:24.462: 2/3 (675) timestamp=1824529616 fr-msg-tx CSI

*Mar 22 03:45:25.162: 2/3 (675) timestamp=1824530316 fr-msg-tx DIS

*Mar 22 03:45:25.414: 2/3 (675) timestamp=1824530566 FR_BAD_CRC_LS_DATA 0x0 bytes

*Mar 22 03:45:29.854: 2/3 (675) timestamp=1824535006 fr-msg-tx CSI

*Mar 22 03:45:30.542: 2/3 (675) timestamp=1824535696 fr-msg-tx DIS

*Mar 22 03:45:30.794: 2/3 (675) timestamp=1824535946 FR_BAD_CRC_LS_DATA 0x0 bytes

*Mar 22 03:45:35.202: 2/3 (675) timestamp=1824540356 fr-msg-tx CSI

*Mar 22 03:45:35.894: 2/3 (675) timestamp=1824541046 fr-msg-tx DIS

*Mar 22 03:45:36.142: 2/3 (675) timestamp=1824541296 FR_BAD_CRC_LS_DATA 0x0 bytes

*Mar 22 03:45:40.562: 2/3 (675) timestamp=1824545716 fr-msg-tx CSI

*Mar 22 03:45:41.274: 2/3 (675) timestamp=1824546426 fr-msg-tx DIS

*Mar 22 03:45:41.454: 2/3 (675) timestamp=1824546606 FR_BAD_CRC_LS_DATA 0x0 bytes

*Mar 22 03:45:45.882: 2/3 (675) timestamp=1824551036 fr-msg-tx CSI

*Mar 22 03:45:46.594: 2/3 (675) timestamp=1824551746 fr-msg-tx DIS

*Mar 22 03:45:46.774: 2/3 (675) timestamp=1824551926 FR_BAD_CRC_LS_DATA 0x0 bytes

*Mar 22 03:45:51.222: 2/3 (675) timestamp=1824556376 fr-msg-tx CSI

*Mar 22 03:45:51.914: 2/3 (675) timestamp=1824557066 fr-msg-tx DIS

*Mar 22 03:45:52.122: 2/3 (675) timestamp=1824557276 FR_BAD_CRC_LS_DATA 0x0 bytes

*Mar 22 03:45:56.594: 2/3 (675) timestamp=1824561746 FR_BAD_CRC_LS_DATA 0x0 bytes

Does anybody know what does this "FR_BAD_CRC_LS_DATA" mean and why do we get it???

Thanks a lot!

6 REPLIES
Bronze

Re: T38 fax relay between H.323 and MGCP gateways

Try using the command "mgcp fax t38 gateway force" on the mgcp gateway

http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/products_feature_guide09186a008008015d.html

Re: T38 fax relay between H.323 and MGCP gateways

Hi,

Well, this command was actually used on MGCP gateways. The problem is that T.38 is working - I can see it on a different trace. The problem is with this particular error message - I have never seen it anywhere before and I do not understand what it means. I suspect the problem is with the syncronization but I am not sure.

New Member

Re: T38 fax relay between H.323 and MGCP gateways

Did you ever resolve this issue?

Re: T38 fax relay between H.323 and MGCP gateways

No. The customer has decided to stop paying the money to get it fixed so I have not got any chance to spend more time on it.

New Member

Re: T38 fax relay between H.323 and MGCP gateways

Thanks, I think our customer is about to give up to. I cannot make it work to save my life.

Bill

New Member

T38 fax relay between H.323 and MGCP gateways

This could have been a codec issues just seen a similar thing on my system and found that making it use a particular codec fixed the issues. i needed G711ulaw not sure what you would need in this instance.

1732
Views
0
Helpful
6
Replies
CreatePlease to create content