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The Hop Counter / Max Forwards Interworking field can enable or disable the mapping of the Hop Counter Parameter in the ISUP IAM message and the Max Forward Header in the SIP INVITE. When enabled, the IMG will map the Hop Counter parameter and the Max Forwards Header so there is a correlation between the two. This feature prevents a loop from happening when call is made between the PSTN and SIP domain. The Hop Counter / Max Forward feature is consistent with RFC 3261 and ITU Q.1912.5 specifications and is supported in both ANSI and ITU protocols.
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