Managing the PSTN Transformation

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• Customer can use his old devices.

• Enables a cheap and fast migration.

• Low risk of churn.

3. All-IP migration path (Voice over Broadband, VoBB) (Figure4.21):

• e whole network is IP based (all-IP solution).

• IP router has to be installed in each premise of the customer.

• In some cases new devices are needed for the customer.

• Future-proof solution.

e above-described migration paths do not represent stand-alone

solutions. All options may be used in parallel within the migration

plan, depending on the chosen migration strategy (Figure4.22).

IP Telephone

Smartphone

PC Softphone

IP PBX

IP Router

IP Centrex

IP Centrex

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