The issue happens when Kamailio receive MSRP message like ``` MSRP e1df91d477cc632a SEND To-Path: msrp://3.236.25.4:5060/s.57471.1.1260517458;tcp msrp://[2600:1f18:63e1:6937:c504:55a1:e141:6810]:2855/e3e5c58412a3479fb007238b3729403a;tcp From-Path: msrp://192.168.122.2:2855/88fafa933e5144ffa59e;tcp Message-ID: f7d1b51d7ec9ad2d Byte-Range: 1-365/365 Success-Report: no Failure-Report: no Content-Type: message/cpim
From: +12134445566 sip:+12134445566@wv.nga911.com To: sip:+13044598081@wv.nga911.com DateTime: 2020-09-06T11:07:09.980093+03:00
MIME-Version: 1.0 Content-Type: application/im-iscomposing+xml
<?xml version='1.0' encoding='UTF-8'?> <isComposing xmlns="urn:ietf:params:xml:ns:im-iscomposing"><state>active</state><contenttype>text</contenttype></isComposing> ```
Kamailio acts as MSRP relay between IPv4 and IPv6 clients.