I am running asterisk 1.6.0.1. I have a Grandstream GXP280 phone I use for testing. In addition I register a zoiper SIP soft phone. For the Grandstream I have busylevel=1 in sip.conf. If I place a call from the GXP280 to zoiper and then put that call on hold from the zoiper side and then call GXP280's extension, asterisk indicates the phone is ringing. As the GXP280 is a single line phone it does not ring the second call. I would have expected the call to get a busy as I have busylevel set to one. I have tried setting busylevel to two as well with the same result. Can someone let me know what I should look at to see why I am not getting a busy instead of ringing? Here are the definitions in sip.conf for the GXP280 and zoiper: [dickenson] type=friend context=empl nat=yes host=dynamic secret=<password> callerid=Jim Dickenson <108> mailbox=108 at ourvm [GXP280] type=friend context=empl host=dynamic secret=<password> callerid=GXP280 <109> mailbox=109 at ourvm busylevel=1 TIA -- Jim Dickenson mailto:dickenson at cfmc.com CfMC http://www.cfmc.com/