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- Avaya - IP500 IP Office, IP500 Trunk, IP400 ISDN PRI 60 E1, - Accepts Connections from AAPT, Carrier ISDN Compatibility.
Avaya - IP500 IP Office, IP500 Trunk, IP400 ISDN PRI 60 E1, - Accepts Connections from AAPT, Carrier ISDN Compatibility.
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