Hello, I have repeated the results with two Asterisk via dynamic: the first Asterisk is configured as nai dynamic for both called and calling, the second is configured with both set to national and: ss7_internationalprefix = 00 ss7_nationalprefix = 0 ss7_subscriberprefix = ss7_unknownprefix = from the first machine a SIP phone with callerid set to 00035952555555 is calling the second machine so with dynamic it sends nai to 4, but sends 035952555555 as the number (to recreate what i am getting from the provider) even the second machine is set to nai = national there is no difference like when it set to dynamic ... logs attached -------------- next part -------------- A non-text attachment was scrubbed... Name: in1 Type: application/octet-stream Size: 3249 bytes Desc: not available Url : http://lists.digium.com/pipermail/asterisk-ss7/attachments/20090311/351a7d9a/attachment.obj -------------- next part -------------- A non-text attachment was scrubbed... Name: in2 Type: application/octet-stream Size: 3193 bytes Desc: not available Url : http://lists.digium.com/pipermail/asterisk-ss7/attachments/20090311/351a7d9a/attachment-0001.obj