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1. Create a Header Rule that adds the User-to-User header and populates it with the value stored in SG User Value 1. SG User Value 1 would have been populated using a different SMM rule at the ingress SG.

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   Caption 0 Figure 1 Create SIP Header Rule Image Modified

2. When the SBC creates the new header, the case of the letters is not preserved (all the upper-case letters are sent as lower-case). To re-establish the proper case, make a second entry in the SMM table - a Raw Rule. Set the regex input to the lower-case and the regex output to the desired case. The Raw Rule will restore the desired case.

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   Caption 0 Figure 1 Create SIP Raw Message Rule Image Modified

3. The resulting SMM table. Make sure to apply the SMM Table to the egress Signaling Group.

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   Caption 0 Figure 1 User To to User Image Modified

Output Invite

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