Thanks for Response Michael,
This is the capture of wireshark

INVITE sip:3333@192.168.4.18:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.4.244:5065;branch=z9hG4bK9268238112493813801;rport
From: 30000 <sip:30000@192.168.4.18:5060>;tag=1653316119
To: "3333" <sip:3333@192.168.4.18:5060>
Call-ID: 188371401128256-63249236018@192.168.4.244
CSeq: 1 INVITE
Contact: <sip:30000@192.168.4.244:5065>
Max-Forwards: 70
Supported: replaces, join, path
User-Agent: Voip Phone 1.0
Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, UPDATE, MESSAGE
Content-Type: application/sdp
Content-Length: 185

v=0
o=30000 24630637 15149730 IN IP4 192.168.4.244
s=A conversation
c=IN IP4 192.168.4.244
t=0 0
m=audio 10006 RTP/AVP 8 0
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=sendrecv