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So how does portability add to the complexity? Carriers charge each other based on a defined set of network codes, and ported numbers are exceptions to those codes, which are normally invisible to the carriers involved. When mobile subscribers port their numbers from one network to another, the original mobile network treats that call as "out of network" and either rejects the call, or connects it at a much higher rate – obviously an untenable answer for the SIM card operator in a highly competitive business. Number portability is a growing reality in many parts of the world, with porting rates ranging from a small percentage in some markets, to almost 50 percent in countries with flexible porting and contract rules. One could argue that whenever there is an ongoing difference between the cost of using service normally available in the country – for example, retail SIM cards – and an official interconnect rate, service providers make use of the difference in many countries this has reached the point where there are two parallel services. ![]() Many thriving businesses provide call termination based on this method, and they all bill the calling carrier based on a defined set of codes that "belong" to the destination mobile operator. Termination costs are lower, albeit with reduced feature functionality such as an incorrect or missing display of the caller's number. As such, each channel in the VoIP gateway acts as an individual mobile phone making calls to other mobile phones on the network. These gateways originate calls into the mobile network using a wireless connection, with special low rates offered for calls made to customers on the same network. The second, unofficial method VoIP providers use to terminate calls to mobile operators is via SIM card-based, VoIP gateways. The drawback, however, is that in many countries, the terminating provider must pay an officially regulated interconnection fee. #CLOWNFISH FOR SKYPE CROSSED OUT FULL#This type of interconnect provides full, PSTN quality termination with full feature availability, including correct delivery of the "calling line identity" and support from roaming calls. The first method is via official interconnects – either TDM or VoIP based – with the destination mobile operator. ![]() #CLOWNFISH FOR SKYPE CROSSED OUT FOR MAC#
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