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| Model 3540 Handset Emulation Option |
Option A: GSM/VOIP to PSTN phone connection: |
Model 3540 Option B: GSM/VOIP to GSM/VOIP phone connection:
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| Model 3540 Handset Emulation Option |
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Option A: GSM/VOIP to PSTN phone connection: |
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Model 3540 Option B: GSM/VOIP to GSM/VOIP phone connection:
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