External SIP Extension Rings on direct Sip calls but hangs up immediately when picked up

[Thomas6]

External SIP Extension Rings on direct Sip calls but hangs up immediately when picked up

My Infrastructure:

3CX PBX Edition 15.5.5 installed from debian-8.6.0-amd64-netinst-3cx.iso
with all Updates

3CX Softphone on iOS

---------------------------------------------------------------------------------
DNS Server is on the same System

Im not sure if my dns configuration is correct.

this is the entry in the dnszone file.
_______________________________________________
; BIND reverse data file for empty rfc1918 zone
; DO NOT EDIT THIS FILE - it is used for multiple zones.
; Instead, copy it, edit named.conf, and use that copy.
;
$TTL 86400

@ IN SOA debian.local. root.localhost. (
1 ; Serial
604800 ; Refresh
86400 ; Retry
2419200 ; Expire
86400 ) ; Negative Cache TTL
;
IN A 10.0.1.253
@ IN NS localhost.
sip.debian.local IN A 10.0.1.253
_sip._udp.debian.local. IN SRV 20 1 5060 sip.debian.local.
__________________________________________________________


the respons from nslookup is:
____________________________________
nslookup -q=SRV _sip._udp.debian.local
Server: 127.0.0.1
Address: 127.0.0.1#53

_sip._udp.debian.local service = 20 1 5060 sip.debian.local.
_________________________________________________

The sip settings in the 3cx system allows in and out




I get alway the following error message: (Register/ Unregister)



Does anyone knows how to solve this problem.

Best Regards Thomas