Chrome Browser log
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SIP Client
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Fri Jan 05 2018 10:11:11 GMT+0530 (India Standard Time) | sip.transport | received WebSocket text message:

NOTIFY sip:1netld8n@192.0.2.138;transport=wss SIP/2.0
Via: SIP/2.0/WSS 192.216.107.162:7443;branch=z9hG4bK07c2.5fa49204000000000000000000000000.0
To: <sip:3006@devlab.tetravx.com>;tag=4v55deva1r
From: <sip:3002@devlab.tetravx.com>;tag=822c6284e4bee0b0060bd960db79ffa4-53d1
CSeq: 3 NOTIFY
Call-ID: t4us30ohrg9ckcqo25lv
Content-Length: 253
Max-Forwards: 70
Event: presence
Contact: <sip:192.216.107.162:7443;transport=ws>
Subscription-State: active;expires=3495
Content-Type: application/pidf+xml

<?xml version="1.0" encoding="UTF-8"?>
<presence xmlns="urn:ietf:params:xml:ns:pidf" entity="sip:3002@devlab.tetravx.com;transport=UDP">
  <tuple id="3002">
     <status><basic>open</basic></status>
     <note>On the phone</note>
  </tuple>
</presence>

Fri Jan 05 2018 10:11:11 GMT+0530 (India Standard Time) | sip.transport | sending WebSocket message:

SIP/2.0 200 OK
Via: SIP/2.0/WSS 192.216.107.162:7443;branch=z9hG4bK07c2.5fa49204000000000000000000000000.0
To: <sip:3006@devlab.tetravx.com>;tag=4v55deva1r
From: <sip:3002@devlab.tetravx.com>;tag=822c6284e4bee0b0060bd960db79ffa4-53d1
Call-ID: t4us30ohrg9ckcqo25lv
CSeq: 3 NOTIFY
Supported: 100rel, outbound
User-Agent: TetraVX Communicator
Content-Length: 0

main.js:13239 i am in subscription
main.js:13240 <?xml version="1.0" encoding="UTF-8"?>
<presence xmlns="urn:ietf:params:xml:ns:pidf" entity="sip:3002@devlab.tetravx.com;transport=UDP">
  <tuple id="3002">
     <status><basic>open</basic></status>
     <note>On the phone</note>
  </tuple>
</presence>

======================

WebRTC client
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Fri Jan 05 2018 10:20:19 GMT+0530 (India Standard Time) | sip.transport | sending WebSocket message:

SUBSCRIBE sip:3006@devlab.tetravx.com SIP/2.0
Via: SIP/2.0/TCP 192.0.2.138;branch=z9hG4bK8380139
Max-Forwards: 70
To: <sip:3006@devlab.tetravx.com>
From: <sip:3006@devlab.tetravx.com>;tag=s2rgd6kfq7
Call-ID: t4us3m159pv2p721vmbj
CSeq: 2446 SUBSCRIBE
Proxy-Authorization: Digest algorithm=MD5, username="3006", realm="devlab.tetravx.com", nonce="Wk8FOFpPBAytLjxo4eg3IOBQ5Fby+dDx", uri="sip:3006@devlab.tetravx.com", response="776fb0671f946466d009b4472469f0f3"
Event: presence
Expires: 3600
Contact: <sip:1netld8n@192.0.2.138;transport=wss>
Allow: ACK,CANCEL,INVITE,MESSAGE,BYE,OPTIONS,INFO,NOTIFY,REFER
Supported: 100rel, outbound
User-Agent: TetraVX Communicator
Content-Length: 0

main.js:2900 Fri Jan 05 2018 10:20:19 GMT+0530 (India Standard Time) | sip.transport | received WebSocket text message:

SIP/2.0 202 OK
Via: SIP/2.0/TCP 192.0.2.138;branch=z9hG4bK8380139;rport=52268;received=49.248.153.166
To: <sip:3006@devlab.tetravx.com>;tag=822c6284e4bee0b0060bd960db79ffa4-13c8
From: <sip:3006@devlab.tetravx.com>;tag=s2rgd6kfq7
Call-ID: t4us3m159pv2p721vmbj
CSeq: 2446 SUBSCRIBE
Expires: 3600
Contact: <sip:192.216.107.162:7443;transport=ws>
Content-Length: 0