R-URI is always the first branch and append_branch() functions add additional
destinations. So if you do 2 append_branch(), you end up with 3 destinations.
If you want to modify r-uri, assign to $ru or use sbranch functions from pv module.
If you want to discuss further on this topic, write a message to
sr-users(a)lists.kamailio.org mailing list.
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