<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>Hello,</div>
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<div>I have a subnet with a Kamailio and some phones. Unfortunately these phones are the only ones in the network that are unaware of the prefixes for the sip usernames. These prefixes should be added by Kamailio. For INVITEs its no problem as $ru/$rU are writeable.</div>
<div>Problem: If I send a REFER message to an other phone I want to add a prefix to the username in the Refer-To header. However, the $rt pseudo variable is read only.</div>
<div>Question: How can Kamailio modify the username of the URI in the Refer-To header?</div>
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<div>Best regards and thanks in advance,</div>
<div>Stefan<br/>
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