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There are two methods supported by the IMG to interwork Called Party Number digits between SIP & SS7. One method labeled Enbloc requires that all the Destination address information be included in the IAM or INVITE. The other method is Overlap. The IMG currently supports Overlap Receiving where the destination address is contained in an IAM and SAM sequence of messages or a series of INVITES, each containing one or more destination address digits. The received digits are buffered until the configured minimum number of digits is received at which point the outgoing call is made with the destination address Enbloc. Refer to the IMG 1010 - Overlap Signaling - Receiving and IMG 1010 - Overlap Signaling - Sending - SIP to SS7 topics.
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