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One way calling?


nathans
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Hi,

 

I have a snomone+ with a bunch of internal (in the lan) and external (via the internet) phones connecting no problems....except in one external location.

 

This is a regular DSL connection house were I have connected a 300 (and tried also with a 821) both running the latest .35 FW.

 

WIth any of the phones I can get incoming calls perfectly with excellent audio.

The problem is this phone can NOT dial to any of the other extensions. On it you do not even get a dialing or busy signal and on the remote extension you get 1ring and then nothing more.

 

Any ideas on what to start looking for? On the DLS modem I have even tried putting the phone in a DMZ zone to see if this helps. Nothing.

I have the required ports open on the snomone+ location firewall and have some 5 others phones registering remotely from other locations with no problem. It is only this one location.

 

Any ideas?

 

Tkx

Nathan

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Here is the log from the snomone on an attempted call from extension 7788 (the external problem one to extension 9999.

 

192.168.30.2 is the LAN IP address of the snomone+

 

[7] 2012/02/23 21:58:03: SIP Rx udp:189.25.204.17:22928:

INVITE sip:9999@192.168.30.2:5060;user=phone SIP/2.0

Via: SIP/2.0/UDP 189.25.204.17:22928;branch=z9hG4bK-w7plx9ppz0hw;rport

From: "Jacobo " <sip:7788@192.168.30.2:5060>;tag=bpgfum53tr

To: <sip:9999@192.168.30.2:5060;user=phone>

Call-ID: 3c2677382783-7fnzl9w6qqo7

CSeq: 1 INVITE

Max-Forwards: 70

Contact: <sip:7788@189.25.204.17:22928;line=7ybp1ezv>;reg-id=1

X-Serialnumber: 0004133B3E16

P-Key-Flags: keys="3"

User-Agent: snom300/8.4.35

Accept: application/sdp

Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE, PRACK, MESSAGE, INFO, UPDATE

Allow-Events: talk, hold, refer, call-info

Supported: timer, 100rel, replaces, from-change

Call-Info: <sip:187.174.100.120>;appearance-index=1

Session-Expires: 3600;refresher=uas

Min-SE: 90

Proxy-Require: buttons

Content-Type: application/sdp

Content-Length: 533

 

v=0

o=root 642205070 642205070 IN IP4 189.25.204.17

s=call

c=IN IP4 189.25.204.17

t=0 0

m=audio 22972 RTP/AVP 0 8 9 2 3 18 4 101

a=crypto:1 AES_CM_128_HMAC_SHA1_32 inline:Uu3rCyl9ghfeMZrR2Z18tEwKwzutivBHnjdRfbMR

a=rtpmap:0 PCMU/8000

a=rtpmap:8 PCMA/8000

a=rtpmap:9 G722/8000

a=rtpmap:2 G726-32/8000

a=rtpmap:3 GSM/8000

a=rtpmap:18 G729/8000

a=fmtp:18 annexb=no

a=rtpmap:4 G723/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=ptime:20

a=rtcp-22973xr:voip-metrics stat-summary=loss,dup,jitt

a=sendrecv

[7] 2012/02/23 21:58:03: SIP Tx udp:189.25.204.17:22928:

SIP/2.0 100 Trying

Via: SIP/2.0/UDP 189.25.204.17:22928;branch=z9hG4bK-w7plx9ppz0hw;rport=22928

From: "Jacobo " <sip:7788@192.168.30.2:5060>;tag=bpgfum53tr

To: <sip:9999@192.168.30.2:5060;user=phone>;tag=49c5c1f64d

Call-ID: 3c2677382783-7fnzl9w6qqo7

CSeq: 1 INVITE

Content-Length: 0

 

[7] 2012/02/23 21:58:03: SIP Tx udp:189.25.204.17:22928:

SIP/2.0 401 Authentication Required

Via: SIP/2.0/UDP 189.25.204.17:22928;branch=z9hG4bK-w7plx9ppz0hw;rport=22928

From: "Jacobo " <sip:7788@192.168.30.2:5060>;tag=bpgfum53tr

To: <sip:9999@192.168.30.2:5060;user=phone>;tag=49c5c1f64d

Call-ID: 3c2677382783-7fnzl9w6qqo7

CSeq: 1 INVITE

User-Agent: snom-PBX/2011-4.2.1.4025

WWW-Authenticate: Digest realm="192.168.30.2",nonce="b8977264cfb4066cfecd45ea0d085090",domain="sip:9999@192.168.30.2:5060;user=phone",algorithm=MD5

Content-Length: 0

 

[7] 2012/02/23 21:58:03: SIP Rx udp:189.25.204.17:22928:

ACK sip:9999@192.168.30.2:5060;user=phone SIP/2.0

Via: SIP/2.0/UDP 189.25.204.17:22928;branch=z9hG4bK-w7plx9ppz0hw;rport

From: "Jacobo " <sip:7788@192.168.30.2:5060>;tag=bpgfum53tr

To: <sip:9999@192.168.30.2:5060;user=phone>;tag=49c5c1f64d

Call-ID: 3c2677382783-7fnzl9w6qqo7

CSeq: 1 ACK

Max-Forwards: 70

Contact: <sip:7788@189.25.204.17:22928;line=7ybp1ezv>;reg-id=1

Proxy-Require: buttons

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Rx udp:189.25.204.17:22928:

CANCEL sip:9999@192.168.30.2:5060;user=phone SIP/2.0

Via: SIP/2.0/UDP 189.25.204.17:22928;branch=z9hG4bK-tnlw528ee5y9;rport

From: "Jacobo " <sip:7788@192.168.30.2:5060>;tag=bpgfum53tr

To: <sip:9999@192.168.30.2:5060;user=phone>

Call-ID: 3c2677382783-7fnzl9w6qqo7

CSeq: 2 CANCEL

Max-Forwards: 70

Reason: SIP;cause=487;text="Request terminated by user"

Proxy-Require: buttons

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Tx udp:189.25.204.17:22928:

SIP/2.0 100 Trying

Via: SIP/2.0/UDP 189.25.204.17:22928;branch=z9hG4bK-tnlw528ee5y9;rport=22928

From: "Jacobo " <sip:7788@192.168.30.2:5060>;tag=bpgfum53tr

To: <sip:9999@192.168.30.2:5060;user=phone>;tag=49c5c1f64d

Call-ID: 3c2677382783-7fnzl9w6qqo7

CSeq: 2 CANCEL

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Tx udp:216.19.16.77:3072:

INVITE sip:9999@216.19.16.77:3072;line=msef87x4 SIP/2.0

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-1e9e57e84c9ce2bcdf8b6a220d2d25c0;rport

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=514136832

To: "Nathan" <sip:9999@pbx.snom.com>

Call-ID: 15293691@pbx

CSeq: 17146 INVITE

Max-Forwards: 70

Contact: <sip:9999@192.168.30.2:5060;transport=udp>

Supported: 100rel, replaces, norefersub

Allow-Events: refer

Allow: INVITE, ACK, CANCEL, BYE, REFER, PRACK, INFO, UPDATE

Accept: application/sdp

User-Agent: snom-PBX/2011-4.2.1.4025

Alert-Info: <http://127.0.0.1/Bellcore-dr2>

Content-Type: application/sdp

Content-Length: 384

 

v=0

o=- 1576670420 1576670420 IN IP4 192.168.30.2

s=-

c=IN IP4 192.168.30.2

t=0 0

m=audio 59018 RTP/AVP 0 8 9 18 2 3 101

a=rtpmap:0 pcmu/8000

a=rtpmap:8 pcma/8000

a=rtpmap:9 g722/8000

a=rtpmap:18 g729/8000

a=fmtp:18 annexb=no

a=rtpmap:2 g726-32/8000

a=rtpmap:3 gsm/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=rtcp-xr:rcvr-rtt=all voip-metrics

a=sendrecv

[7] 2012/02/23 21:58:09: SIP Rx udp:189.25.204.17:22928:

CANCEL sip:9999@192.168.30.2:5060;user=phone SIP/2.0

Via: SIP/2.0/UDP 189.25.204.17:22928;branch=z9hG4bK-tnlw528ee5y9;rport

From: "Jacobo " <sip:7788@192.168.30.2:5060>;tag=bpgfum53tr

To: <sip:9999@192.168.30.2:5060;user=phone>

Call-ID: 3c2677382783-7fnzl9w6qqo7

CSeq: 2 CANCEL

Max-Forwards: 70

Reason: SIP;cause=487;text="Request terminated by user"

Proxy-Require: buttons

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Tr udp:189.25.204.17:22928:

SIP/2.0 100 Trying

Via: SIP/2.0/UDP 189.25.204.17:22928;branch=z9hG4bK-tnlw528ee5y9;rport=22928

From: "Jacobo " <sip:7788@192.168.30.2:5060>;tag=bpgfum53tr

To: <sip:9999@192.168.30.2:5060;user=phone>;tag=49c5c1f64d

Call-ID: 3c2677382783-7fnzl9w6qqo7

CSeq: 2 CANCEL

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Tx udp:75.149.181.121:3072:

INVITE sip:9999@192.168.88.107:3072;line=ad4e2gld SIP/2.0

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-64737b79c64e7dda8e1071014447f2da;rport

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=1112862256

To: "Nathan" <sip:9999@pbx.snom.com>

Call-ID: 19bbc33d@pbx

CSeq: 16740 INVITE

Max-Forwards: 70

Contact: <sip:9999@192.168.30.2:5060;transport=udp>

Supported: 100rel, replaces, norefersub

Allow-Events: refer

Allow: INVITE, ACK, CANCEL, BYE, REFER, PRACK, INFO, UPDATE

Accept: application/sdp

User-Agent: snom-PBX/2011-4.2.1.4025

Alert-Info: <http://127.0.0.1/Bellcore-dr2>

Content-Type: application/sdp

Content-Length: 384

 

v=0

o=- 1241561074 1241561074 IN IP4 192.168.30.2

s=-

c=IN IP4 192.168.30.2

t=0 0

m=audio 64382 RTP/AVP 0 8 9 18 2 3 101

a=rtpmap:0 pcmu/8000

a=rtpmap:8 pcma/8000

a=rtpmap:9 g722/8000

a=rtpmap:18 g729/8000

a=fmtp:18 annexb=no

a=rtpmap:2 g726-32/8000

a=rtpmap:3 gsm/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=rtcp-xr:rcvr-rtt=all voip-metrics

a=sendrecv

[7] 2012/02/23 21:58:09: SIP Tx udp:189.25.204.17:22928:

SIP/2.0 200 Ok

Via: SIP/2.0/UDP 189.25.204.17:22928;branch=z9hG4bK-tnlw528ee5y9;rport=22928

From: "Jacobo " <sip:7788@192.168.30.2:5060>;tag=bpgfum53tr

To: <sip:9999@192.168.30.2:5060;user=phone>;tag=49c5c1f64d

Call-ID: 3c2677382783-7fnzl9w6qqo7

CSeq: 2 CANCEL

Contact: <sip:7788@192.168.30.2:5060>

User-Agent: snom-PBX/2011-4.2.1.4025

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Tx tls:192.168.30.106:3117:

SIP/2.0 487 Request Terminated

From: <>

To: <>

Call-ID:

CSeq: 0

Contact: <sip:7788@192.168.30.2:5061>

Supported: 100rel, replaces, norefersub

Allow-Events: refer

Allow: INVITE, ACK, CANCEL, BYE, REFER, PRACK, INFO, UPDATE

Accept: application/sdp

User-Agent: snom-PBX/2011-4.2.1.4025

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Tx udp:216.19.16.77:3072:

CANCEL sip:9999@216.19.16.77:3072;line=msef87x4 SIP/2.0

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-1e9e57e84c9ce2bcdf8b6a220d2d25c0;rport

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=514136832

To: "Nathan" <sip:9999@pbx.snom.com>

Call-ID: 15293691@pbx

CSeq: 17146 CANCEL

Max-Forwards: 70

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Tx udp:75.149.181.121:3072:

CANCEL sip:9999@192.168.88.107:3072;line=ad4e2gld SIP/2.0

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-64737b79c64e7dda8e1071014447f2da;rport

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=1112862256

To: "Nathan" <sip:9999@pbx.snom.com>

Call-ID: 19bbc33d@pbx

CSeq: 16740 CANCEL

Max-Forwards: 70

Content-Length: 0

 

[3] 2012/02/23 21:58:09: Could not connect to 74.208.67.196:8888

[1] 2012/02/23 21:58:09: Could not send via TCP: 36 bytes

[7] 2012/02/23 21:58:09: SIP Rx udp:75.149.181.121:3072:

SIP/2.0 180 Ringing

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-64737b79c64e7dda8e1071014447f2da;rport=5060

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=1112862256

To: "Nathan" <sip:9999@pbx.snom.com>;tag=l34qs3dgkb

Call-ID: 19bbc33d@pbx

CSeq: 16740 INVITE

Contact: <sip:9999@192.168.88.107:3072;line=ad4e2gld>;reg-id=1

Require: 100rel

RSeq: 1

Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE, PRACK, MESSAGE, INFO, UPDATE

Allow-Events: talk, hold, refer, call-info

Content-Length: 0

 

[5] 2012/02/23 21:58:09: Call 19bbc33d@pbx: Last request not finished

[7] 2012/02/23 21:58:09: SIP Tx udp:75.149.181.121:3072:

PRACK sip:9999@192.168.88.107:3072;line=ad4e2gld SIP/2.0

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-80a284f90c91b350b17fa32bd6ed2db5;rport

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=1112862256

To: "Nathan" <sip:9999@pbx.snom.com>;tag=l34qs3dgkb

Call-ID: 19bbc33d@pbx

CSeq: 16741 PRACK

Max-Forwards: 70

Contact: <sip:9999@192.168.30.2:5060;transport=udp>

RAck: 1 16740 INVITE

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Rx udp:75.149.181.121:3072:

SIP/2.0 200 OK

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-64737b79c64e7dda8e1071014447f2da;rport=5060

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=1112862256

To: "Nathan" <sip:9999@pbx.snom.com>;tag=l34qs3dgkb

Call-ID: 19bbc33d@pbx

CSeq: 16740 CANCEL

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Rx udp:75.149.181.121:3072:

SIP/2.0 487 Request Terminated

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-64737b79c64e7dda8e1071014447f2da;rport=5060

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=1112862256

To: "Nathan" <sip:9999@pbx.snom.com>;tag=l34qs3dgkb

Call-ID: 19bbc33d@pbx

CSeq: 16740 INVITE

Contact: <sip:9999@192.168.88.107:3072;line=ad4e2gld>;reg-id=1

Content-Length: 0

 

[7] 2012/02/23 21:58:09: Call 19bbc33d@pbx: Clear last INVITE

[7] 2012/02/23 21:58:09: SIP Tx udp:75.149.181.121:3072:

ACK sip:9999@192.168.88.107:3072;line=ad4e2gld SIP/2.0

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-64737b79c64e7dda8e1071014447f2da;rport

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=1112862256

To: "Nathan" <sip:9999@pbx.snom.com>;tag=l34qs3dgkb

Call-ID: 19bbc33d@pbx

CSeq: 16740 ACK

Max-Forwards: 70

Contact: <sip:9999@192.168.30.2:5060;transport=udp>

Content-Length: 0

 

[5] 2012/02/23 21:58:09: INVITE Response 487 Request Terminated: Terminate 19bbc33d@pbx

[7] 2012/02/23 21:58:09: SIP Rx udp:216.19.16.77:3072:

SIP/2.0 100 Trying

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-1e9e57e84c9ce2bcdf8b6a220d2d25c0;rport=5060

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=514136832

To: "Nathan" <sip:9999@pbx.snom.com>;tag=dt3ujuapv2

Call-ID: 15293691@pbx

CSeq: 17146 INVITE

Contact: <sip:9999@216.19.16.77:3072;line=msef87x4>;reg-id=1

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Rx udp:216.19.16.77:3072:

SIP/2.0 180 Ringing

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-1e9e57e84c9ce2bcdf8b6a220d2d25c0;rport=5060

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=514136832

To: "Nathan" <sip:9999@pbx.snom.com>;tag=dt3ujuapv2

Call-ID: 15293691@pbx

CSeq: 17146 INVITE

Contact: <sip:9999@216.19.16.77:3072;line=msef87x4>;reg-id=1

Require: 100rel

RSeq: 1

Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE, PRACK, MESSAGE, INFO, UPDATE

Allow-Events: talk, hold, refer, call-info

Content-Length: 0

 

[5] 2012/02/23 21:58:09: Call 15293691@pbx: Last request not finished

[7] 2012/02/23 21:58:09: SIP Tx udp:216.19.16.77:3072:

PRACK sip:9999@216.19.16.77:3072;line=msef87x4 SIP/2.0

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-e37fd0d92c9114104c622a8936e89505;rport

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=514136832

To: "Nathan" <sip:9999@pbx.snom.com>;tag=dt3ujuapv2

Call-ID: 15293691@pbx

CSeq: 17147 PRACK

Max-Forwards: 70

Contact: <sip:9999@192.168.30.2:5060;transport=udp>

RAck: 1 17146 INVITE

Content-Length: 0

 

[7] 2012/02/23 21:58:09: SIP Rx udp:75.149.181.121:3072:

SIP/2.0 481 Call Leg/Transaction Does Not Exist

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-80a284f90c91b350b17fa32bd6ed2db5;rport=5060

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=1112862256

To: "Nathan" <sip:9999@pbx.snom.com>;tag=l34qs3dgkb

Call-ID: 19bbc33d@pbx

CSeq: 16741 PRACK

User-Agent: snom870/8.4.33

Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE, PRACK, MESSAGE, INFO, UPDATE

Allow-Events: talk, hold, refer, call-info

Supported: timer, 100rel, replaces, from-change

Content-Length: 0

 

[3] 2012/02/23 21:58:09: Could not connect to 74.208.67.196:8888

[1] 2012/02/23 21:58:09: Could not send via TCP: 36 bytes

[7] 2012/02/23 21:58:09: SIP Tr udp:216.19.16.77:3072:

CANCEL sip:9999@216.19.16.77:3072;line=msef87x4 SIP/2.0

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-1e9e57e84c9ce2bcdf8b6a220d2d25c0;rport

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=514136832

To: "Nathan" <sip:9999@pbx.snom.com>

Call-ID: 15293691@pbx

CSeq: 17146 CANCEL

Max-Forwards: 70

Content-Length: 0

 

[7] 2012/02/23 21:58:10: SIP Rx udp:216.19.16.77:3072:

SIP/2.0 200 OK

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-1e9e57e84c9ce2bcdf8b6a220d2d25c0;rport=5060

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=514136832

To: "Nathan" <sip:9999@pbx.snom.com>;tag=dt3ujuapv2

Call-ID: 15293691@pbx

CSeq: 17146 CANCEL

Content-Length: 0

 

[7] 2012/02/23 21:58:10: SIP Rx udp:216.19.16.77:3072:

SIP/2.0 487 Request Terminated

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-1e9e57e84c9ce2bcdf8b6a220d2d25c0;rport=5060

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=514136832

To: "Nathan" <sip:9999@pbx.snom.com>;tag=dt3ujuapv2

Call-ID: 15293691@pbx

CSeq: 17146 INVITE

Contact: <sip:9999@216.19.16.77:3072;line=msef87x4>;reg-id=1

Content-Length: 0

 

[7] 2012/02/23 21:58:10: Call 15293691@pbx: Clear last INVITE

[7] 2012/02/23 21:58:10: SIP Tx udp:216.19.16.77:3072:

ACK sip:9999@216.19.16.77:3072;line=msef87x4 SIP/2.0

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-1e9e57e84c9ce2bcdf8b6a220d2d25c0;rport

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=514136832

To: "Nathan" <sip:9999@pbx.snom.com>;tag=dt3ujuapv2

Call-ID: 15293691@pbx

CSeq: 17146 ACK

Max-Forwards: 70

Contact: <sip:9999@192.168.30.2:5060;transport=udp>

Content-Length: 0

 

[5] 2012/02/23 21:58:10: INVITE Response 487 Request Terminated: Terminate 15293691@pbx

[3] 2012/02/23 21:58:10: Could not connect to 74.208.67.196:8888

[1] 2012/02/23 21:58:10: Could not send via TCP: 36 bytes

[7] 2012/02/23 21:58:10: SIP Rx udp:216.19.16.77:3072:

SIP/2.0 481 Call Leg/Transaction Does Not Exist

Via: SIP/2.0/UDP 192.168.30.2:5060;branch=z9hG4bK-e37fd0d92c9114104c622a8936e89505;rport=5060

From: "Jacobo " <sip:7788@pbx.snom.com>;tag=514136832

To: "Nathan" <sip:9999@pbx.snom.com>;tag=dt3ujuapv2

Call-ID: 15293691@pbx

CSeq: 17147 PRACK

User-Agent: snom821/8.4.35

Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE, PRACK, MESSAGE, INFO, UPDATE

Allow-Events: talk, hold, refer, call-info

Supported: timer, 100rel, replaces, from-change

Content-Length: 0

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You are experiencing the famous "NAT" problem. In a nutshell, in VoIP you must make sure that the PBX runs on a "routable" IP address. Routable means routable for the registered phones and PSTN gateways, and also sometimes routable for service providers that dont have a session border controller.

 

You can achieve the routable by running the PBX at least on one interface on a "public" IP; here you must make sure that the routing table is set up properly, sometimes the OS picks the private IP address as the "preferred" IP address which would cause problems then.

 

Another way to get routable IP addresses is to use a VPN for the company. This also solves the problem as if everything would be in the LAN.

 

Putting the PBX into a DMZ is possible, but very tricky because especially the RTP ports can be very hard to predict and TCP port forwarding also can be tricky.

 

IPv6 offers very cheap routable IP addresses, but is as of today not widely available. One nice day when IPv6 is available, we can save a lot of time for things like this.

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Thanks. I also thought this was the problem. But you see, the PBX is indeed with a public and routable IP address with the correct port forwarding. I have about 5 extensions registering remotely to it and being able to make and received calls from

 

It is only one remote extension that is showing this problems of not being able to make outgoing calls. Are you referring to the fact that this one extension needs something special besides being either on a DMZ or with the correct SIP and UDP ports forwarded?

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