Paytia provides flexible SIP call control on a per-telephone-number basis. Each telephone number can have its own routing, number translation, number formatting and external termination rules.
This enables businesses and service providers to control how inbound calls are presented, how outbound calls are identified and where calls are delivered.
Paytia can translate one telephone number into another as a call passes through the Paytia network.
For example:
A caller dials DDI A.
Paytia receives the inbound call against DDI A.
Paytia routes the call onward using DDI B as the presented or destination telephone number.
This allows the inbound number and the number used for onward routing to be different.
Number translation can be configured separately for each DDI, supporting use cases such as:
Mapping public telephone numbers to internal or private routing numbers.
Presenting a different caller ID on the outbound call leg.
Migrating telephone services without changing the public number advertised to customers.
Routing calls into different PBX platforms, contact centres or SIP services.
Supporting different telephone numbering plans across carriers and business systems.
Protecting internal destination numbers from being exposed externally.
The translation rule is applied by Paytia before the call is passed to the selected SIP destination.
Different carriers, telephone platforms and business systems may require telephone numbers to be presented in different formats.
Paytia can convert telephone numbers between the following common formats:
The full international telephone number, including the country code and without a leading zero.
Example:
+442071832744
The telephone number in national format, including the domestic leading zero.
Example:
02071832744
The national telephone number with the leading zero removed.
Example:
2071832744
Paytia can convert numbers both to and from these formats, depending on the requirements of the originating carrier, receiving SIP endpoint or connected business application.
For example, Paytia can:
Receive a number in E.164 format and send it onward in national format.
Receive a national number with a leading zero and convert it to E.164.
Add or remove the international + prefix.
Add or remove the national leading zero.
Apply the correct country code.
Normalise numbers before routing or reporting.
Number formatting rules can be configured for each DDI and each call direction. This helps prevent calls from failing because one platform expects a different number format from another.
Paytia can terminate calls to external SIP IP endpoints.
For each DDI, Paytia can maintain a list of authorised SIP destination endpoints. Calls can then be distributed between those endpoints in a round-robin order.
For example, a DDI could be configured with the following destinations:
SIP Endpoint A
SIP Endpoint B
SIP Endpoint C
SIP Endpoint D
The first call is sent to Endpoint A, the next call to Endpoint B, followed by Endpoint C and Endpoint D. The routing process then returns to Endpoint A and repeats.
This allows call traffic to be distributed across multiple:
Session Border Controllers.
PBX platforms.
Contact-centre systems.
SIP application servers.
Geographic locations.
Data centres.
Carrier interconnections.
Paytia can support as many SIP IP endpoints as required for each DDI, subject to the agreed service configuration and capacity.
Because the endpoint list is configured per telephone number, different DDIs can use different routing groups.
For example:
Sales calls can be distributed across one group of SIP endpoints.
Support calls can use a separate endpoint group.
Payment calls can be routed to a dedicated secure environment.
Different customers or departments can have their own SIP termination rules.
Individual DDIs can be routed to different countries, offices or platforms.
Round-robin routing helps distribute call volume and reduces dependence on a single destination. Where supported by the agreed routing configuration, Paytia can also use endpoint availability and call failure responses to determine whether a call should be attempted against another destination.
The main benefit of Paytia SIP call control is that routing is not limited to one configuration for the entire business account.
Each DDI can have its own:
Inbound number.
Translated destination number.
Outbound caller ID.
Number formatting rules.
SIP endpoint list.
Round-robin routing order.
Call direction rules.
Customer, department or service assignment.
This provides granular control over how every telephone number behaves as calls enter and leave the Paytia network.
A typical call may follow this process:
A customer calls DDI A in national format.
Paytia receives and identifies the called DDI.
Paytia applies the routing rules assigned to DDI A.
The destination number is translated from DDI A to DDI B.
Paytia converts DDI B into the number format required by the receiving platform.
Paytia selects the next external SIP endpoint in the round-robin list.
The call is delivered to the selected endpoint.
The next call for that DDI is sent to the next endpoint in the configured sequence.
Paytia SIP call control enables businesses to:
Connect carriers and telephone systems that use different numbering formats.
Migrate between telephone platforms without changing customer-facing numbers.
Distribute calls across multiple systems or locations.
Configure routing independently for each DDI.
Reduce dependency on a single SIP endpoint.
Separate call flows by customer, department or service.
Maintain consistent telephone number presentation.
Simplify complex carrier and PBX integration requirements.
Create flexible routing without changing the originating or receiving platform.
Paytia acts as the call-control layer between the originating telephone network and the destination SIP service, applying the required translation, formatting and routing rules before each call is delivered.