26. VoLTE SIP Preconditions

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SIP Preconditions: A complex way to reserve the network resources (radio ones being the most sensitive) before the phone rings in both sides. Without preconditions you might end in a situation where A call B, B responds, the network wants to allocate radio resources to the call, there are no resources left and the call is dropped by the network.Not a nice situation. However, there should not be many situations like this one since there is a lot of LTE capacity already, a call needs 50kbps and it have precedence over any other traffic like Internet browsing.

SIP Preconditions solution brings some extra messages and a lot of headaches to the mobile operators.

SIP Preconditions must be supported by the phone (sends in SIP Invite: Supported: precondition) and it can be disabled by the network.

Orange Romania: yes, for VoLTE-VoLTE calls, VoLTE to outside calls, outside to VoLTE calls

Orange VoLTE VoLTE call, view from Mobile Originating UE:








Digi Mobil Romania: no Preconditions for all calls... Digi takes some risks :)

Digi VoLTE VoLTE call, view from Mobile Originating UE::




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