SIP ping

sip_ping.py

#!/usr/bin/env python3
import socket
import time
 
userid = "trivial_sip_pinger"
domain = "<sip server to test>"
port = 5060
timeout_ms = 1000
 
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.settimeout(timeout_ms / 1000.0)
sock.connect((domain,port))
 
ip,localport = sock.getsockname()
 
packet = """OPTIONS sip:{domain} SIP/2.0
Via: SIP/2.0/UDP {ip}:{localport}
To: "{userid}"<sip:{userid}@{domain}>
From: "{userid}"<sip:{userid}@{domain}>
Call-ID: nevermind
CSeq: 1 OPTIONS
Max-forwards: 10
Content-Length: 0
""".format(domain=domain, ip=ip, userid=userid, localport=localport)
 
# print(packet)
 
start = time.time()
sock.send(packet.encode('ascii'))
data, addr = sock.recvfrom(65535)
end = time.time()
 
diff = float("%.2f" % ((end - start) * 1000.0))
response = data.decode('ascii')
print("Timing: {} ms\n\nResponse: {}".format(diff,response))

See also:

• https://blog.cloudflare.com/everything-you-ever-wanted-to-know-about-udp-sockets-but-were-afraid-to-ask-part-1/
• https://blog.cloudflare.com/how-to-stop-running-out-of-ephemeral-ports-and-start-to-love-long-lived-connections/
• https://blog.cloudflare.com/how-to-receive-a-million-packets/