Configuring Grandstream GXW4104 FXO via SBC

[JCubio]

Hi all,

Is there any documentation/instructions out there on how to configure a grandstream fxo via SBC?
According here, it will work but I can't find an actual documenation.

I'm a total newbie in voice technologies specially gateway devices so I do rely on documentations.

TIA

 

[SweetAction]

Officially it isn't supported.

I typically provision locally and then update the SIP server address to point to the SBC.

 

[JCubio]

Am I doing it right sir?
SBC IP = 192.168.0.62


Provisioning link from 3CX

 

[SweetAction]

Looks correct to me, although the real test is... does it register/work?

 

[JCubio]

It does register now.
I can do an outbound but not inbound.
3CX can see the inbound call from logs but can't place it to the extension

Do you have an idea where do I need to change sir?

 

[SweetAction]

So when not behind a SBC, does inbound work?

Can you direct call an extension from another?

I suspect not and it's likely the SBC is not the cause. You need to post full logs, I suspect an inbound rule is incorrect.

 

[JCubio]

So when not behind a SBC, does inbound work?

I haven't tested that one sir. Our 3CX is in cloud

As for the logs, this is what I see

11/28/2019 5:17:04 PM - [CM500002]: Unidentified incoming call. Review INVITE and adjust source identification:
Invite-UNK Recv Req INVITE from 127.0.0.1:5080 tid=0286f4f380555123 [email protected]:
INVITE sip:[email protected]:5060;transport=UDP SIP/2.0
Via: SIP/2.0/UDP 127.0.0.1:5080;branch=z9hG4bK-524287-2---0286f4f380555123;rport=5080
Via: SIP/2.0/UDP [::ffff:58.69.59.97]:26830;branch=z9hG4bK-524287-1---tunneltid;rport;tnlid=sbc.895f4bb6
Via: SIP/2.0/UDP 192.168.0.63:5060;branch=z9hG4bK0286f4f380555123
Max-Forwards: 68
Record-Route: <sip:[email protected]:5080;user=proxy;uri=sbc.895f4bb6>
Record-Route: <sip:[email protected]:5060;user=proxy;tnlid=sbc.895f4bb6>
Proxy-Require: 192.168.0.62
Contact: <sip:192.168.0.63:5060>
To: <sip:002@ourfqdn:5060>
From: <siprivate@ourfqdn:5060>;tag=eee526136ee4b683
Call-ID: [email protected]
CSeq: 27906 INVITE
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, OPTIONS, INFO, SUBSCRIBE, UPDATE, PRACK
Content-Type: application/sdp
Proxy-Authorization: Digest username="",realm=""
Supported: replaces, timer, path
User-Agent: Grandstream GXW4104 (HW 2.3, Ch:2) 1.4.1.5
Content-Length: 279

v=0
o=system 8002 8002 IN IP4 192.168.0.63
s=SIP Call
c=IN IP4 127.0.0.1
t=0 0
m=audio 14126 RTP/AVP 0 8 4 18 3 2
a=sendrecv
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:4 G723/8000
a=rtpmap:18 G729/8000
a=rtpmap:3 GSM/8000
a=rtpmap:2 G726-32/8000
a=ptime:20

 

[SweetAction]

Is this a 3CX support SIP provider?

Can you direct call an extension from another?

 

[JCubio]

Normally, our inbound and outbound works from standard SIP trunks (we have DIDLogic and mVoice)
The one I'm referring to is the inbound from the grandstream gateway

 

[SweetAction]

My bad - Didn't read clearly enough to see you were doing a FXO (not FXS).

The log shows an issue - it's not getting source ID.

11/28/2019 5:17:04 PM - [CM500002]: Unidentified incoming call. Review INVITE and adjust source identification:
Invite-UNK Recv Req INVITE from 127.0.0.1:5080 tid=0286f4f380555123 Call-

I'll bow out of this - perhaps someone else can assist - without access and more specific information it's complicated for me to troubleshoot over a forum.

You might want to see if any changes here help (SIP Trunks-The Grandstream):

 

[eddv123]

FYI if you don't want to configure the SBC IP address manually in the device (to risk possibly a reset removing the settings for example) you might want to look at extracting and altering the primary template for the device (creating a custom one) and simply changing the 3CX address to SBC in there and then applying it to the box.

 

[JCubio]

Hi All,
Inbound and outbound now works.
Now I'm adding the 2nd PSTN Line. But how do I specify the outbound rule to use a specific line?

 

[leejor]

But how do I specify the outbound rule to use a specific line.

You would have to create each line as an individual trunk, or use a gateway that allows a prefix digit to specify the line. I believe that some Grandstreams will do the latter.

 

[JCubio]

This is solved