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:[email protected]>
To: <sip:[email protected]>
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.
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