Simple and effective call management
Numbers that make sense
Presentation Numbers are available in conjunction with Business Phone Lines, ISDN PR, ISDN BR, Centrex and IP Multimedia. And you have a choice of five types:
Type 1
This number is generated by the subscriber's network provider. It’s stored in the network and applied to an outgoing call at the local exchange by the provider.
Verification & authenticity
Because the number is applied by network equipment, there’s no need for it to be verified each time a call is made. Instead, the level of authenticity will depend on the checks made by a network provider that a subscriber is entitled to use a particular presentation number.
Type 2
This identifies a caller's extension number behind a DDI switchboard. Although the number or partial number is generated by the user's own equipment, the network provider is able to check that it falls within the range and length allocated to a particular subscriber. That way, the authenticity of the number can be ensured..
Verification & authenticity
This type of number is considered to carry sufficient authenticity to be classified as a network number and is carried as such by some networks.
Type 3
Limited to the far-end breakout scenario where a call's access to the public network may be different to where it was originated (e.g. where there are several transitions between several service providers). The number is generated by the user's equipment but isn’t capable of being subjected to network verification procedures.
Verification & authenticity
Verification is based on a contract between the subscriber and the network provider in which the subscriber gives an undertaking that only authentic calling party numbers will be generated.
Type 4
A presentation number available for the onward transmission of the originating number where a call breaks into a private network and breaks out again before termination. On the breakout leg, the number is generated by the user's equipment although it will have already been verified in consequence of having been delivered to the private network.
Verification & authenticity
To maintain the verification, it’s necessary to ensure that the number submitted by the private network is the number that was received. Where a Type 4 service is offered by the network provider, the subscriber must give a contractual commitment that they will only submit CLIs that have been received from the public network. Unlike other types of presentation numbers, Type 4 numbers may not always be ‘diallable’; this will depend on the nature of the number received from the public network.
Type 5
Presentation numbers that identify separate groups of callers behind a private network switch wishing to send different outgoing CLIs. A typical scenario is a call centre making calls on behalf of more than one client.
Verification & authenticity
Type 5 presentation numbers are generated by the user's equipment. Subscribers will need to enter into a similar contractual commitment with their network providers as for Type 1 presentation numbers - i.e. that they’re entitled to use the numbers they have selected.
All good sense, really.
Downloads
Got a question? Call us on 0800 953 0180