09-08-2009 06:19 AM - edited 03-15-2019 07:40 PM
Hello,
has anyone ever succeeded running CUCM 7.x and Exchange 2007 with Fax over T.38?
I tried and failed due to a lack of documentation and knowledge.
Even with hardware MTP,T.38 mline and Fax Inline Detection set I got only voicemail running. When it comes to fax it doees not detect CNF tones.
Can someone supply me with gateway config (voice service voip & dial-peer) as well as any non-standard cucm and exchange server configuration?
Regards & Thanks
Sebastian
09-08-2009 11:43 PM
Hi Sebastian I have worked with 2,3 customers for this deployment in CUCM 7.x
Normal error is check region to be G711 and MTP config in IOS router.
dspfarm profile 3 mtp
codec g711ulaw
maximum sessions hardware 34
associate application SCCP
Normallly you need to add
"codec pass-through" command to detect tones.
Let us know which type of MTP and VGW you are using.
09-09-2009 04:44 AM
Hi,
thanks for the reply
VGW is a 2821 Router + NM-HDV + 3x PVDM-12 + VWIC-1MFT-E1
IOS: 12.4.22T1
MTP is 2811 Router + PVDM2-32
IOS: 12.4.15T9
Is a hardware MTP mandatory? I've seen that only in some posts not in any official documentation.
We're using G711alaw from end to end. Is there a restriction that requires G711ulaw here?
Sebastian
09-10-2009 01:23 AM
Back in our lab i did some testing:
symptom remains unchanged:
Exchange 2007 answers a voice call, does not detect a fax but mentions invalid input by the fax machine on the other side and finally hung up.
VGW Config:
voice service voip
allow-connections h323 to h323
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip
h323
h225 signal overlap
modem passthrough nse codec g711alaw
sip
registrar server
transport switch udp tcp
asymmetric payload dynamic-codecs
dial-peer voice 1000 voip
destination-pattern XXXX
modem passthrough nse codec g711ulaw
session target ipv4:
codec g711ulaw
fax-relay ecm disable
fax-relay sg3-to-g3
fax rate 14400
fax protocol t38 nse ls-redundancy 0 hs-redundancy 0 fallback none
no vad
MTP config:
dspfarm profile 2 mtp
codec g711ulaw
maximum sessions hardware 16
associate application SCCP
The new MRGL is assigned to the H323 GW and to the Exchange SIP Trunk
Changing (end to end) to g711alaw does not change anything
Sebastian
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