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--- tutorials:faq:main [2018/05/08 06:23] – [General] miconda
+++ tutorials:faq:main [2018/05/08 06:30] – [SIP Message Processing] miconda
@@ Line 234: / Line 234: @@
 }
 </code>
+Very important is also to be aware that doing same operation many times in request_route is not overwriting the previous value, but combines them. For example, if you do two times uac_replace_from(), the From header can become corrupt. Like:
+<code c>
+request_route {
+  ...
+  uac_replace_from("sip:test1@kamailio.org");
+  uac_replace_from("sip:test2@kamailio.org");
+  ...
+}
+</code>
+Results in From header having the URI: "sip:test1@kamailio.orgsip:test2@kamailio.org". Again, use branch_route to do the operations if you need different From header for outgoing branches.
 ??? How to remove a single header field when a header appears multiple times?