[Users] Call gets always busy!

[Ronald Wiplinger]

I have set-up two Grandstream phones, one is inside my LAN and one is 
outside.

Below is the ngrep output. Can you please explain me both (openserctl ul 
show    and   ngrep) and where the problem my be?

7111 calls 7211, both are registerd as:
...Record(0x2b68516ca938)...
domain: 'location'
aor   : '7111'
~~~Contact(0x2b68516ca9b0)~~~
domain    : 'location'
aor       : '7111'
Contact   : 'sip:7111 at 192.168.250.115'
Expires   : 404
q         :
Call-ID   : '748276c266577824 at 192.168.250.115'
CSeq      : 10157
User-Agent: 'Grandstream GXV3000 1.0.0.24'
received  : ''
Path      : ''
State     : CS_NEW
Flags     : 0
Sock      : 192.168.250.41:5060 (0x610fc0)
Methods   : 7807
next      : (nil)
prev      : (nil)
~~~/Contact~~~~
.../Record...
...Record(0x2b68516d0950)...
domain: 'location'
aor   : '7211'
~~~Contact(0x2b68516cb7d0)~~~
domain    : 'location'
aor       : '7211'
Contact   : 'sip:7211 at 192.168.87.103'
Expires   : 2382
q         :
Call-ID   : '8d96c35345b355d7 at 192.168.87.103'
CSeq      : 10001
User-Agent: 'Grandstream GXV3000 1.0.0.24'
received  : ''
Path      : ''
State     : CS_NEW
Flags     : 0
Sock      : 59.124.210.41:5060 (0x610ef0)
Methods   : 7807
next      : (nil)
prev      : (nil)
~~~/Contact~~~~
.../Record...





#
U 2006/09/26 10:49:27.574906 192.168.250.115:5060 -> 192.168.250.41:5060
INVITE sip:7211 at 192.168.250.41 SIP/2.0.
Via: SIP/2.0/UDP 192.168.250.115;branch=z9hG4bKf777932528b49881.
From: <sip:7111 at 192.168.250.41>;tag=d71217459a54cde3.
To: <sip:7211 at 192.168.250.41>.
Contact: <sip:7111 at 192.168.250.115>.
Supported: replaces, timer.
Call-ID: 76740d0122a46445 at 192.168.250.115.
CSeq: 15245 INVITE.
User-Agent: Grandstream GXV3000 1.0.0.24.
Max-Forwards: 70.
Allow: 
INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK.
Content-Type: application/sdp.
Content-Length: 438.
.
v=0.
o=7111 8000 8000 IN IP4 192.168.250.115.
s=SIP Call.
c=IN IP4 192.168.250.115.
t=0 0.
m=audio 15004 RTP/AVP 0 3 18 4 8.
a=sendrecv.
a=rtpmap:0 PCMU/8000.
a=rtpmap:3 GSM/8000.
a=rtpmap:18 G729/8000.
a=rtpmap:4 G723/8000.
a=rtpmap:8 PCMA/8000.
a=ptime:20.
m=video 15006 RTP/AVP 99.
a=sendrecv.
a=rtpmap:99 H264/90000.
a=fmtp:99 profile-level-id=42801E; packetization-mode=0; 
sprop-parameter-sets=J0KAFJWgUH5A,KM4C/ID=.
a=framerate:15.

#
U 2006/09/26 10:49:27.587708 192.168.250.41:5060 -> 192.168.250.115:5060
SIP/2.0 100 trying -- your call is important to us.
Via: SIP/2.0/UDP 192.168.250.115;branch=z9hG4bKf777932528b49881.
From: <sip:7111 at 192.168.250.41>;tag=d71217459a54cde3.
To: <sip:7211 at 192.168.250.41>.
Call-ID: 76740d0122a46445 at 192.168.250.115.
CSeq: 15245 INVITE.
Server: OpenSer (1.1.0-notls (x86_64/linux)).
Content-Length: 0.
Warning: 392 192.168.250.41:5060 "Noisy feedback tells:  pid=31770 
req_src_ip=192.168.250.115 req_src_port=5060 
in_uri=sip:7211 at 192.168.250.41 out_uri=sip:7211 at 192.168.87.103 via_cnt==1".
.

#
U 2006/09/26 10:49:56.862266 192.168.250.41:5060 -> 192.168.250.115:5060
SIP/2.0 408 Request Timeout.
Via: SIP/2.0/UDP 192.168.250.115;branch=z9hG4bKf777932528b49881.
From: <sip:7111 at 192.168.250.41>;tag=d71217459a54cde3.
To: <sip:7211 at 192.168.250.41>;tag=fa997f81440371de71ab448ebdb9af56-37d0.
Call-ID: 76740d0122a46445 at 192.168.250.115.
CSeq: 15245 INVITE.
Server: OpenSer (1.1.0-notls (x86_64/linux)).
Content-Length: 0.
Warning: 392 192.168.250.41:5060 "Noisy feedback tells:  pid=31771 
req_src_ip=192.168.250.115 req_src_port=5060 
in_uri=sip:7211 at 192.168.250.41 out_uri=sip:7211 at 192.168.87.103 via_cnt==0".
.

#
U 2006/09/26 10:49:56.865291 192.168.250.115:5060 -> 192.168.250.41:5060
ACK sip:7211 at 192.168.250.41 SIP/2.0.
Via: SIP/2.0/UDP 192.168.250.115;branch=z9hG4bKf777932528b49881.
From: <sip:7111 at 192.168.250.41>;tag=d71217459a54cde3.
To: <sip:7211 at 192.168.250.41>;tag=fa997f81440371de71ab448ebdb9af56-37d0.
Contact: <sip:7111 at 192.168.250.115>.
Call-ID: 76740d0122a46445 at 192.168.250.115.
CSeq: 15245 ACK.
User-Agent: Grandstream GXV3000 1.0.0.24.
Max-Forwards: 70.
Allow: 
INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK.
Content-Length: 0.
.

#