[2.0.0a4] - Can't hangup my own call + Solution

[Wufus]

When i make call with:
mycall = phone.call(number)
and when the caller answers, I want to hang up:
mycall.hangup()
the message BYE seems not properly, because Asterisk say

SIP/2.0 401 Unauthorized

and

SIP/2.0 501 Not Implemented

The To: tag seems to be missing, but it should be there
<--- Received SIP request (430 bytes) from UDP:192.168.7.214:20020 --->
BYE sip:192.168.7.200:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.7.214:20020;branch=z9hG4bK4e07408562bedb8b60ce05c1d
From: <sip:77501@192.168.7.214:20020>;tag=4bd9541c
To: <sip:210@192.168.7.200>
Call-ID: 4b227777d4dd1fc61c6f884f48641d02@192.168.7.214:20020
CSeq: 2 BYE
Max-Forwards: 70
Contact: <sip:77501@192.168.7.214:20020>
User-Agent: pyVoIP 2.0.0a4
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, NOTIFY
Content-Length: 0

[Wufus]

Found a workaround for me, but it may break any other scenarios:

client.py
class SIPClient:
 def _gen_bye_cancel(self, request: SIPMessage, cmd: str) -> str:
  ...
  if request.headers["From"]["tag"] == tag:
   byeRequest += self.__gen_from_to_via_request(request, "From", tag)
   byeRequest += f"To: {to['raw']};tag={to['tag']}\r\n"                # added ";tag={to['tag']}"
  ...
  cseq = request.headers["CSeq"]["check"] + 1                          # added "+ 1"
  ...

[Wufus]

pyVoIP/pyVoIP/SIP.py

Lines 1517 to 1537 in 6c2aaef

	def gen_bye(self, request: SIPMessage) -> str:
	tag = self.tagLibrary[request.headers["Call-ID"]]
	c = request.headers["Contact"].strip("<").strip(">")
	byeRequest = f"BYE {c} SIP/2.0\r\n"
	byeRequest += self._gen_response_via_header(request)
	fromH = request.headers["From"]["raw"]
	toH = request.headers["To"]["raw"]
	if request.headers["From"]["tag"] == tag:
	byeRequest += f"From: {fromH};tag={tag}\r\n"
	if request.headers["To"]["tag"] != "":
	to = toH + ";tag=" + request.headers["To"]["tag"]
	else:
	to = toH
	byeRequest += f"To: {to}\r\n"
	else:
	byeRequest += (
	f"To: {fromH};tag=" + f"{request.headers['From']['tag']}\r\n"
	)
	byeRequest += f"From: {toH};tag={tag}\r\n"
	byeRequest += f"Call-ID: {request.headers['Call-ID']}\r\n"
	cseq = int(request.headers["CSeq"]["check"]) + 1

It seems, that bug does not exist in v1.6.8