-------------------------------------------
09:18:37,924: R: <SIPproxyIP>:port (TCP)
SIP/2.0 200 OK
Via: SIP/2.0/TCP <PhonerLiteIP>:PLport;received=<PhonerLiteIP>;rport=50041;branch=z9hG4bK80847aecb6a2e811991f166e0d816d15
From: "PhonerLite" <sip:202@siptest.local>;tag=3672644403
To: <sip:*7@siptest.local;transport=tcp>;tag=as389e1278
Call-ID: 80847AEC-B6A2-E811-991D-166E0D816D15@192.168.11.59
CSeq: 8 INVITE
Server: ipnordic
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:<SIPproxyIP>;transport=tcp;thinfo="U2h5YhUORg5uUBNZW1dIUAQadlZjRlFWUV0DBHJXRGgWBhZdBwxxSWRaTVBWXxgGcF9pXVNUVg==">
Content-Type: application/sdp
Require: timer
Content-Length: 349

v=0
o=root 317700079 317700079 IN IP4 <RTPproxyIP>
s=asterisk
c=IN IP4 <RTPproxyIP>
t=0 0
m=audio 10794 RTP/SAVP 9 8 101
a=rtpmap:9 G722/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=sendrecv
a=rtcp:10795
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:xxxx
a=ptime:20


and sends ACK like this:

09:18:37,925: T: <SIPproxyIP>:port (TCP)
ACK sip:<SIPproxyIP>;transport=tcp;thinfo=%22U2h5YhUORg5uUBNZW1dIUAQadlZjRlFWUV0DBHJXRGgWBhZdBwxxSWRaTVBWXxgGcF9pXVNUVg%3D%3D%22 SIP/2.0
Via: SIP/2.0/TCP <PhonerLiteIP>:50041;branch=z9hG4bK80847aecb6a2e8119920166e0d816d15;rport
From: "PhonerLite" <sip:202@siptest.local>;tag=3672644403
To: <sip:*7@siptest.local;transport=tcp>;tag=as389e1278
Call-ID: 80847AEC-B6A2-E811-991D-166E0D816D15@<PhonerLiteIP>
CSeq: 8 ACK
Contact: <sip:202@<PhonerLiteIP>:5073;transport=tcp;gr=000DECE5-B6A2-E811-9915-166E0D816D15>
Authorization: Digest username="202", realm="asterisk", nonce="7b4251ac", uri="sip:<SIPproxyIP>;transport=tcp;thinfo=%22U2h5YhUORg5uUBNZW1dIUAQadlZjRlFWUV0DBHJXRGgWBhZdBwxxSWRaTVBWXxgGcF9pXVNUVg%3D%3D%22", response="6b0d210c9bfe881ec91e3aa163209087", algorithm=MD5
Max-Forwards: 70
Content-Length: 0

So PhonerLite urlencodes RURI in ACK request, but it must be not encoded:
ACK sip:<SIPproxyIP>;transport=tcp;thinfo="U2h5YhUORg5uUBNZW1dIUAQadlZjRlFWUV0DBHJXRGgWBhZdBwxxSWRaTVBWXxgGcF9pXVNUVg==" SIP/2.0