Thanks Anthony,It works!
I did 2 basic tests with FS T.38 gateway and CallWeaver T.38 gateway.
Test 1 (PSTN to T.38 ATA)
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60 voice (concurrent) calls & 30 FAX (concurrent) calls
success rate;
for FreeSwitch : 97.3% with 10,000 faxes(single A4 text document)
for CallWeaver : 83.2% with 10,000 faxes(single A4 text document)
Test 2 (PSTN to T.38 ATA)
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30 FAX (concurrent) calls
success rate;
for FreeSwitch : 97.8% with 10,000 faxes(single A4 text document)
for CallWeaver : 99.4% with 10,000 faxes(single A4 text document)
FS is best for my situation!
Here is my new dial plan.(for archival purpose)
dialplan for G711(from PSTN/SS7 via SIP) to T.38(to SIP ATAs)
------>8--------
<extension name="g711_to_t.38">
<condition field="destination_number" expression="^1(0\d{8})$">
<action application="set" data="t38_gateway_detect_timeout=60"/>
<action application="pre_answer"/>
<action application="set" data="ringback=%(1000, 4000, 400.0, 400.0)"/>
<action application="t38_gateway" data="peer"/>
<action application="hangup"/>
</condition>
</extension>
dialplan for T.38(from SIP ATAs) to G711(to PSTN/SS7 via SIP)
------>8--------
<extension name="t.38_to_g711">
<condition field="destination_number" expression="^(0\d+)$">
<action application="set" data="t38_gateway_detect_timeout=60"/>
<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