Hi,<br> <br>We are using "Asterisk" in our office and using "XLite" as softphone and your service for making calls to USA. <br> <br> <span style="font-weight: bold;">When I am using SIP, Sometimes It is working fine. But, sometime, when i am trying to make a call to USA, it is telling that <span style="color: rgb(0, 0, 153);">"I am sorry. That is not a valid extension. Please try again. Error No. 2"</span>. But, after sometime, its working fine again without doing anything or any modifications. My intercom is also working fine always. What is this error? Please tell me the solution.</span><br style="font-weight: bold;"> <br style="font-weight: bold;"> <span style="font-weight: bold;">When I am using IAX, It is working fine always. What is the problem with SIP?</span><br> <br> Looking forward to your response.<br> <br> Thanks&Regards,<br> Chandra.<p> 
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