search for: ser_ip_address

...). One of these is an Asterisk which have others clients (sipuraSPA2100). I also have a Cisco GW which give me access to the PSTN. I make calls to all IP phones in my network, but I can't call PSTN numbers. After I dial, I hear 2 ringbacks but at the same time Asterisk says: Called pstn_number@SER_ip_address SIP/SER_ip_address-ec75 is circuit-busy Everyone is busy/congested at this time (1:0/1/0) Then I hear busy tone. I tried thousands of parameters. (Ovbiously not the correct one :-s ) Any body could help me with this? Thanks very much in advance Sebastian