Forum Discussion

Emmanue_1314571's avatar
Emmanue_1314571
SMARTY Maverick
19-06-2025
Solved

SIP

Is it possible to make full SIP calls with a mobile subscription?

  • Decembersangel's avatar
    Decembersangel
    20-06-2025

    Hi Emmanue_1314571 

    SMARTY does not officially support SIP (Session Initiation Protocol) for VoIP (Voice over Internet Protocol) calls. While some users have reported success using SIP with SMARTY, it's not a guaranteed or officially supported feature. SMARTY's network uses CGNAT, which can cause issues with maintaining the necessary connections for SIP to function properly. 
     
    Here's a more detailed explanation:
    • SMARTY's stance:
      SMARTY explicitly states that they do not support VoIP devices or services. 
       
    • CGNAT limitations:
      SMARTY uses Carrier-Grade Network Address Translation (CGNAT), which can interfere with SIP's ability to maintain a persistent connection. 
       
    • Possible workarounds:
      Some users have reported that tweaking SIP settings, like using a shorter SIP OPTIONS interval, can help. However, this is not a guaranteed solution. 
       
    • Alternative VoIP solutions:
      If you need VoIP, you may need to explore alternative providers or consider using a service like Skype that offers virtual numbers and VoIP capabilities. 
       
    • Mobile data and VoLTE:
      SMARTY does support VoLTE (Voice over LTE), which allows for voice calls over the 4G network, but this is a separate technology from SIP. 

      Hope this helsp x

2 Replies

  • Decembersangel's avatar
    Decembersangel
    SMARTY Motivator
    20-06-2025

    Hi Emmanue_1314571 

    SMARTY does not officially support SIP (Session Initiation Protocol) for VoIP (Voice over Internet Protocol) calls. While some users have reported success using SIP with SMARTY, it's not a guaranteed or officially supported feature. SMARTY's network uses CGNAT, which can cause issues with maintaining the necessary connections for SIP to function properly. 
     
    Here's a more detailed explanation:
    • SMARTY's stance:
      SMARTY explicitly states that they do not support VoIP devices or services. 
       
    • CGNAT limitations:
      SMARTY uses Carrier-Grade Network Address Translation (CGNAT), which can interfere with SIP's ability to maintain a persistent connection. 
       
    • Possible workarounds:
      Some users have reported that tweaking SIP settings, like using a shorter SIP OPTIONS interval, can help. However, this is not a guaranteed solution. 
       
    • Alternative VoIP solutions:
      If you need VoIP, you may need to explore alternative providers or consider using a service like Skype that offers virtual numbers and VoIP capabilities. 
       
    • Mobile data and VoLTE:
      SMARTY does support VoLTE (Voice over LTE), which allows for voice calls over the 4G network, but this is a separate technology from SIP. 

      Hope this helsp x
    • Emmanue_1314571's avatar
      Emmanue_1314571
      SMARTY Maverick
      20-06-2025

      Thanks. I was afraid so.