C7 Roaming Signaling

GPRS Roaming Exchange (GRX)

Conversion Service for Different Networks

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Singtel provides carriers and mobile operators ANSI-ITU Signalling Conversion service to facilitate seamless GSM roaming for mobile operators on GSM 850 / 1900 networks to GSM 900 / 1800 networks and vice versa. It enables interoperability between mobile operators in North America operating GSM 850 / 1900 networks on ANSI signalling standards and mobile operators in other parts of the world operating GSM 900 / 1800 networks on ITU signalling standard.


  • Immediate comprehensive coverage to customers on ANSI signalling standards in North America
  • Quality service on our highly reliable and redundant network infrastructure
  • Fast service implementation
  • Cost-effective with competitive and flexible pricing scheme
  • 24x7 customer service

C7 Roaming Signalling Service

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International mobile operators and carriers can enjoy Singtel C7 roaming services via international C7 Signalling Transfer, which provides Signalling Connection Control Part (SCCP) transport over C7 to nearly all active mobile operators worldwide. As an experienced carrier and C7 Signalling Transfer Point provider, Singtel uses highly reliable network for our signalling traffic.

Our STP roaming facilities follow the international recommendations for Message Transfer Part (MPT) protocol and SCCP. The roaming facilities offer extensive coverage and flexibility, with access  to more than 400 roaming partners in over 200 destinations worldwide.


  • Availability per Signalling Transfer Point of higher than 99.9%.
  • Highly reliable and fully redundant network infrastructure.
  • Excellent worldwide coverage to over 400 roaming partners.
  • Short lead time required on implementing customer requests.
  • Flexible pricing schemes to suit the requirements of our customers.
  • 24/x7 technical team for customer queries.

GPRS Roaming Exchange (GRX) / Blackberry Services

A leading GRX provider in Asia Pacific with enabled next generation mobile data services over its Multi Point Label Switching (MPLS)-based, managed IP-VPN network, riding on Singtel's own extensive submarine cable network.

Singtel GRX offers connectivity to RIM Datacentre at Waterloo, Canada. Operators can use the same connectivity (to Singtel GRX) for roaming GPRS traffic to carry Blackberry traffic to / from RIM Datacentre.


  • Immediate GPRS and / or 3G roaming coverage to more than 460 mobile operators.
  • Substantial cost savings with one single connection to Singtel GRX for GPRS and 3G services.
  • Assured quality service on high speed and resilient managed IP backbone.
  • Efficient cost management with scalable connection and ease of upgrade.