Patent ID: 11870601
Assignee: T-MOBILE USA, INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A system, comprising:
one or more processors;
a memory storing components executable by the one or more processors to perform operations comprising:
receiving, from a session management function (SMF), a first SIP request that requests a policy associated with a voice session;
transmitting, to a first policy control function (PCF), the first SIP request;
receiving, from the first PCF, a first SIP response that comprises a first policy identifier corresponding to the policy of the voice session;
forwarding, to the SMF, the first SIP response;
transmitting, to a second PCF, the first SIP request;
receiving, from the second PCF, a second SIP response that comprises a second identifier corresponding to the policy of the voice session;
receiving, from the SMF, a second SIP request that comprises the first policy identifier;
determining that a communication link with the first PCF is interrupted;
generating a modified second SIP request by replacing the first policy identifier with the second policy identifier in the second SIP request; and
transmitting, to the second PCF, the modified second SIP request.