Código Python:
Ver original- import requests 
- import cookielib 
-   
- jar = cookielib.CookieJar() 
-   
- user = 'xxx' 
- clave = 'xxx' 
- url =  'http://dominio.com/sub/index.php' 
- headers = {'Referer':'http://dominio.com/sub/index.php'} 
- valores = {'app': 'page', 'inc': 'login', 'op': 'auth_login', 
-            'username': user, 'password': clave} # Valores para Login 
- r = requests.post(url, data=valores, headers=headers, cookies=jar) # Login 
-   
- postdata = {'hiddcount': ['153'], 
-  'message': ['MIMENSAJE'], 
-  'p_num_text': ['00573122085989'], 
-  'txtcount': ['8 char : 1 Sms']} 
- url = 'http://dominio.com/sub/index.php?app=menu&inc=send_sms&op=sendsmstopv_yes' 
- headers = {'Referer': 'http://dominio.com/sub/index.php?app=menu&inc=send_sms&op=sendsmstopv' } 
- r = requests.post(url, data=posdata, headers=headers, cookies=jar) # enviar sms 
- print r.text 
Mas o menos así?