WTL are specialists in products for telecom operators and we have created our SoIP Gateway using the building blocks of our existing SS7 signalling stack and our VoIP support (H323 or SIP) which have been well-proven over the last 10 years.
Hugely scalable (from 1E1 to multiple STM-1s), WTL switches are known for operating with zero downtime under continuous heavy traffic load. We have deployed this product very widely with customers introducing VoIP to an established network or ISPs needing to connect to 'real' operators at SS7 level.

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