I think after resolving issue:

https://freeswitch.org/jira/browse/FS-5761

It stopped to work on Windows platforms before commits caused by that ticket ports were used started from com5 and upwards. After commit freeswitch wants to use com0.

You can look up as a workaround solution from Jeff Lenk:

https://freeswitch.org/stash/projects/FS/repos/freeswitch/diff/src/mod/applications/mod_spandsp/mod_spandsp_modem.c?until=f42b17e80749250c4957601bae37b8c3ff826c39

Br,

Volodymyr

On Wed, Dec 6, 2017 at 9:22 AM, Volodymyr Fedorov <lexxua@gmail.com> wrote:

Hi I don't remember, but in code exist commit for Linux system which was supposed to fix modem TTY names. But somehow it has regression on Windows systems because modem name could not start from 0.
Br,
Volodymyr

On Dec 6, 2017 8:16 AM, "NYCPhoneService" <nycphoneservice@gmail.com> wrote:
Anyone please…

From: NYCPhoneService [mailto:nycphoneservice@gmail.com]
Sent: Thursday, November 30, 2017 1:40 AM
To: freeswitch-users@lists.freeswitch.org
Subject: mod_spandsp on Windows as modem with com0com - port in use

I guess I’m missing something with this setup:

Freeswitch-1.6.19 built from source on Win 8.1, com0com 3.0 signed, pair on COM6 and COM7 the and soft modem for fax server is on COM7
I had to set number of modems to 6 in config, otherwise I was just getting no modems available…

Mod_spandsp sees the port:

2017-11-29 23:43:52.885349 [DEBUG] mod_spandsp_modem.c:371 Modem COM6 [INIT] - Changing state to INIT
2017-11-29 23:43:52.885349 [INFO] mod_spandsp_modem.c:373 Modem [COM6]->[(null)] Ready

but when I bridge to modem/6/123 I get:

2017-11-29 23:44:49.203916 [ERR] mod_spandsp_modem.c:1390 Modem COM6 In Use!
2017-11-29 23:44:49.203916 [ERR] mod_spandsp_modem.c:1398 No Modems Available!
971de557-adb4-4a19-9e7d-ab4f13b954be 2017-11-29 23:44:49.203916 [ERR] mod_spandsp_modem.c:862 Cannot find a modem.

The same com0com setup works with an old T38Modem with no issues.

Any suggestions are really appreciated

Dennis

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Best regards,

Volodymyr