By using Portech SBK-32 expander for 32 SIM-cards, you can increase the number of channels in the Portech MV-37X GSM VoIP gateway series using the Internet.
Lucent Telecommunications,LLC
We are a voip Wholesale Service Provider, peering and routing voice services, interconnecting and inter-working peer to peer mode (SIP and H323), Residential and business phones.
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