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This code calls the 2410 extension at sip:john1234@phone.plivo.com. The User element describes the SIP endpoint and gives it the attribute sendDigits. To dial the extension a couple of seconds after the number is dialed, we add a few leading w characters, telling Plivo to wait 0.5 seconds for each w. 
from plivo import plivoxml

response = plivoxml.ResponseElement()
response.add(plivoxml.DialElement().add(
    plivoxml.UserElement(
        'sip:john1234@phone.plivo.com', send_digits='wwww2410')))
print(response.to_string())
Response
<Response>
    <Dial>
        <User sendDigits="wwww2410">sip:john1234@phone.plivo.com</User>
    </Dial>
</Response>