Glossary

MTRR – Mobile Terminated Roaming Retry
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MTRR – Mobile Terminated Roaming Retry

MTRR is a technique used in CSFB to reduce the delay that may take place in an MT fallback scenario in which the phone, at the point of fallback, attaches to a different MSC (usually due to Location Area mismatch). In this scenario, the call attempt is bounced back from the original MSC handling the call, allowing the network to retry the call setup, this time to the correct MSC (the MSC to which the mobile has just registered).

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