Unsupported Outbound Calls setup with HT813

[Matrixneo]

Hi - I'm trying to setup HT813 Grandstream with 3CX for Inbound and Outbound Calls via a PSTN line in UAE (etisalat).
Till now i have completed the following setup:
- Configured the HT 813 for Basic Settings, FXS, and FXO Port
- Both FXS and FXO blue lights on the device
- Both FXS and FXO as Registered on the HT813 GUI
- Configured the 3CX with User ext, Gateway, Inbound and Outbound Channels
- 3CX gateway is registered and shows Green
- Tested the connectivity of 3CX on premise server with HT813 and it pings successfully

HT813 Firmware: 1.0.13.3
3CX Version 18.0

On trying the outbound call via the registered user ext on 3CX, it gives the line busy tone and disconnects. I've checked the call logs via log viewer it gives the Failed: Cause 486 Busy Here/Invite

22/01/2022 13:23:21:704 | 10 | [CM503003]: Call(C:71): Call to <sip:[email protected]:5062> has failed; Cause: 486 Busy Here/INVITE from 192.168.0.14:5062

22/01/2022 13:23:21:704 | 10 | Call to T:Line:10000>>00971501234567@[Dev:sip:[email protected]:5062] from L:71.1[Extn:102] failed, cause: Cause: 486 Busy Here/INVITE from 192.168.0.14:5062

For Outbound Rules in 3CX:
Calls to numbers starting with prefix: -
Calls from extension(s): 100-102
Calls to Numbers with a length of: 14

Route 1: GrandStream HT813
Strip Digits: 0
Prepend: -
Outbound Caller: 10000


For Inbound Rules in 3CX:
DID: 10000
CID: 10000

SIP Trunk Configuration:
- SIP User ID: 10000
- Main Trunk: 10000
- HT813 Gateway IP and PORT 5062
- Type of Authentication both works: (1) Do not require - IP based and (2) Registered/Account Based - either of those works, well.

User:
- Outbound Caller ID: 10000

I'm stuck with the Outbound Channel configuration. Unable to figure out from here. Would appreciate some support.

 

[leejor]

There are a number of posts dealing with the HT813 on the 3CX forum...

https://www.3cx.com/community/threads/grandstream-ht813-fxo-issues.62062/

https://www.3cx.com/community/threads/ht813-outgoing-calls.68666/

While there could be any number of settings that are not correct, my first guess (and that's all it is), given the log you posted Cause: 486 Busy Here/INVITE from 192.168.0.14:5062 ,is that it may have something to do with the gateway believing the line is engaged, or not connected. Does the gateway indicate that it "sees" PSTN line voltage?

Are inbound calls working? Are you placing calls using the FXS port on the gateway, or from another device?

 

[Matrixneo]

Yes, I've read those posts and others as a reference point for configuration. It has helped me reach so far.

The Inbound calls are working fine, I've tested it by calling the PSTN from my cell number on Etisalat network and it reaches successfully to 3CX Voip ext as configured.

For the Outbound calls, I'm placing the call via the 3CX Soft Phone (3CX Mobile App). I also ensured the soft phone is always re-provisioned after any changes or before dialing outbound.

How can I check that the gateway is seeing the PSTN line voltage ?
I've checked it via these ways:
- The FXO blue light is turned ON the HT813 gateway
- Tested the PSTN line by directly connecting it to the Analog Phone and hear the dial tone.