network (pstn), in-band signaling is the exchange of call control information within the same physical channel, or within the same frequency band, that the telephone call itself is using. an example is dual-tone multi-frequency signaling (dtmf), which is used on most telephone lines to customer premises...
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desk blotters jotter pad despatch registry book display book dividers document bags duplicate books employee wages card fax rolls thermal rolls files & folders flip chart pads french language products gift wrapping papers gift set with italian pu cover golden books guest books guide cards gum art papers...
desk blotters jotter pad despatch registry book display book dividers document bags duplicate books employee wages card fax rolls thermal rolls files & folders flip chart pads french language products gift wrapping papers gift set with italian pu cover golden books guest books guide cards gum art papers...
desk blotters jotter pad despatch registry book display book dividers document bags duplicate books employee wages card fax rolls thermal rolls files & folders flip chart pads french language products gift wrapping papers gift set with italian pu cover golden books guest books guide cards gum art papers...