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When using T.38 FoIP, if the SIP proxy or gateway introduces a delay in the or modifies the UDPTL packet structure, the XMedius stack can receive an unexpected T.30 frame encapsulated in T.38, leading directly to protocol error 700.
Add this to your SIEM (Splunk/ELK):
The first place to look is within the XMedius administration console. xmedius fax error code 700
Alert when EventID 700 occurs >3 times within 60 minutes for the same SenderCSID .
High-speed transmissions (e.g., V.34/33.6 Kbps) are more susceptible to errors on VoIP or unstable analog lines. When using T
Isolate your system from the carrier. Use an analog loopback plug on your XMedius board or configure a loopback SIP trunk.
If you see that, the remote fax machine is sending a valid document, but your routing metadata (likely DTMF or TSI) is mismatched against your rule set. High-speed transmissions (e
By forcing T.38, disabling V.34, and viewing the T.30 trace, you can transform a cryptic "700" into a clear action item. Remember: fax is a legacy protocol trying to survive on modern networks. Patience, proper configuration, and systematic diagnostics will restore your XMedius system to flawless operation.
High speeds are often the culprit for frame errors in Fax over IP (FoIP) environments.