| http://www.w3.org/ns/prov#value | - es in both directions between telephony devices 8 a-8 n and PSTN 10. [0085] In addition to telephony devices 8 a-8 n, advanced telephone systems, such as call centers 16 a-16 n, may be communicatively connected to PSTN 10 via wireline, wireless, ISDN and other communication links.
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