Greetings, ive been trying to setup an ATA186 for connection to a fax machine, we are using SIP as our primary voip method and i have configured the following parameters in CCME, im aware that there are issues with SIP and Faxing as most providers dont support T.38 but i was hoping to work around this issue by registering the device in SCCP.
voice service voip
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip
no supplementary-service sip moved-temporarily
no supplementary-service sip refer
modem passthrough nse codec g711ulaw
dial-peer voice 8383 voip
incoming called-number 0121*******
fax rate disable
ephone-dn 135 dual-line
number 0121******* no-reg both
label Fax Line
name Fax Line
The ATA is successfully registered with CME using load ATA030203SCCP051201A.zup and is configured as per the attached image, I currently have the ATA plugged into the fax machine on Port 1 but when i try and call the number it just rings out when i would expect to hear a fax tone.
If I am understanding you correctly, when you call the fax machine attached to the ATA it just rings but never answers the call. If you are physically beside the fax machine when it is called, do you actually hear it ringing or are you just hearing ringback from the calling phone's handset? If the fax machine itself is audibly ringing, then this proves that the call is definitely making it to the fax machine and you need to find out why the fax machine is not picking up.
Many fax machines have different answer modes. Make sure that that this fax machine is set to automatically answer incoming calls. Regardless of your topology and network configurations, if the call is hitting the fax machine then it should answer with the CED or ANSAM tone.
OK, it sounds like the call is not making it to the fax machine then. All fax calls start off as regular VoIP calls. Until VoIP works between two endpoints, you do not have to worry about the fax piece. In fact you may just want to replace the fax machine with a standard analog handset as you troubleshoot this VoIP problem.
You mention that the call control protocol is SIP so this would be a good place to start troubleshooting. This sounds like a CME call routing issue since the call is never physically connecting to the fax machine. Unfortunately, troubleshooting CME is not my specialty, so I will let some others chime in to provide additional troubleshooting on this issue. Good luck.
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