Hello list,I able to send & receive faxes via SS7 link. but I have a small problem with "switch_core_media_bug". I noticed "Media bug" activate for first 10 seconds to 20 seconds against SIP channels.
most of our customers use Tele/FAX option on Fax machines. that means ; they answer the call manually (as a voice call) If there was a fax then they activate Fax mode. the problem is FS can't detect CNG tones after 20 seconds, because "switch_core_media_bug" was removed from the particular channels. If the destination fax machine can generate CNG tones within 10 ~ 20 seconds Then FS can detect CNG tones and change in to T.38 mode.
is there any way to increase the window of time (switch_core_media_bug) to listen for the CNG tones on SIP channels?
This is my dialplan for G711(from PSTN/SS7 via SIP) to T.38(to SIP ATAs)
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<extension name="g711_to_t.38">
<condition field="destination_number" expression="^1(0\d{8})$">
<action application="pre_answer"/>
<action application="set" data="ringback=%(1000, 4000, 400.0, 400.0)"/>
<action application="t38_gateway" data="peer"/>
<action application="hangup"/>
</condition>
</extension>
This is my dialplan for T.38(from SIP ATAs) to G711(to PSTN/SS7 via SIP)
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<extension name="t.38_to_g711">
<condition field="destination_number" expression="^(0\d+)$">
<action application="ring_ready" />
<action application="set" data="ringback=%(1000, 4000, 400.0, 400.0)"/>
<action application="start_dtmf_generate" data="true"/>
<action application="t38_gateway" data="self"/>
<action application="hangup"/>
</condition>
</extension>
------>8--------
Thank you.
Weera Suriya