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------ Start of attached email. Subject: Unexpected TTY Message ------
Hello All

I Perform normal audio call test with Freeswitch Server , not sending any
dtmf tones or RTT/TTY but still i am getting TTY Message in freeswitch
server and i received this event : TDD::RECV_MESSAGE

I troubleshoot this issue i check mod_spandsp_dsp.c file and this function
is printing an log [DEBUG] mod_spandsp_dsp.c:151 sofia/internal/
1004@192.168.254.149 got TDD Message [V]
and this put_text_msg function called from spandsp_tdd_decode_session
function with this line : pvt->tdd_state = v18_init(NULL, FALSE,
get_v18_mode(session), V18_AUTOMODING_GLOBAL, put_text_msg, pvt);

can anyone give me idea when this v18_init line executing as per my
understanding when it receive an Text message at that time it is executing
but i dont know how it will detect text message from RTP while it is an
just audio call.

Please give me suggestions on how this v18_init is detecting text it is
related to frequency or any other param and give reference of that file
from where v18_init is getting text messages From RTP.

Let me know if require any further details, Any help is greatly
appreciated.

Regards
Devang Dhandhalya

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