Fax and Modem Over IP

Is it successful and reliable to deploy the fax and modem over IP in production? Does it stable enough to replace the PSTN connection?
Do delay and packet drops in the network affect so much for fax and modem traffic?
How about to implement fax and modem over IP via microwave link?

i have read in the article in the web. here is the link
http://www.soft-switch.org/foip.html
1) Can you comment about implementing POS modem over IP is not reliable and workable.
2) What the fine tune need to do most to successfully deploy the POS over IP?
3) We had using Linksys SPA2102 ATA for the POS machine to be connected to the CUCM. Is it recommended brand ATA for impementing the POS?
4) What is your experience implementing the POS modem? To CUCM or any Media gateway or IP PABX?

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