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Standard User rn170uk2
(newbie) Sun 17-Aug-25 19:41:06
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VOIP with Asus Router - engaged tone on outgoing calls


[link to this post]
 
Hi folks,

As VF have so kindly removed their forum, I'm stuck for support...

I've changed from a RT86U to AXE11000, and have configured everything like for like. The Grandstream connects, and incoming calls work - but outgoing calls always get an engaged tone.

What is more annoying is when I switch back to the RT86U, it no longer works with that too.

Any suggestions most appreciated.
Standard User Ripshod
(regular) Sat 23-Aug-25 09:37:38
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: rn170uk2] [link to this post]
 
The only thing I recall being changed in the voip setup is the User-Agent. Where it used to be "Vox 3.0", it's now "Vox 3.0v".
That's the only thing I've ever seen change in the 4+ years I've been doing this.

Vodafone Full Fibre 500 - My Live BQM (IPv4) - (IPv6)
Standard User Taras
(eat-sleep-adslguide) Sat 23-Aug-25 11:01:36
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: rn170uk2] [link to this post]
 
have you set the sip pass through to disabled

go to wan > nat pass through and then change sip pass through to disabled and hit save


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Standard User rn170uk2
(newbie) Sun 24-Aug-25 22:20:01
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: Ripshod] [link to this post]
 
@Taras, With it set to "Vox 3.0v" I still get an engaged tone on outgoing calls (at the point it would normally ring)
Incoming calls still work.

Edited by rn170uk2 (Sun 24-Aug-25 22:25:04)

Standard User rn170uk2
(newbie) Sun 24-Aug-25 22:23:48
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: Taras] [link to this post]
 
@Ripshod, Yes. It's set to disabled. Still doesn't work. SIP Passthrough and PPPoE Relay is disabled. Everything else in the list is enabled.

Edited by rn170uk2 (Sun 24-Aug-25 22:24:36)

Standard User Taras
(eat-sleep-adslguide) Mon 25-Aug-25 08:23:49
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: rn170uk2] [link to this post]
 
what firmware is the asus on?
Standard User johncc
(newbie) Tue 26-Aug-25 17:26:49
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: Ripshod] [link to this post]
 
Hi all, i have vodafone vdsl with daytek router and grandstream 801 for my digital landline. Ripshod kindly helped me on the setup last yeat on the vodafone forum. All has been working fine until last week, now i can only receive calls but no outgoing calls. i get dial tone, dialling number the silence/disconnect after few seconds.Anyone else having problems or have vodafone changed the parameter for their digital service. i have tried the Vox 3.0v but no change.
Standard User rn170uk2
(newbie) Tue 26-Aug-25 21:20:34
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: Taras] [link to this post]
 
Merlin 3004.388.9_2_rog

I changed mine to Vox 3.0v but whist incoming calls ring, when you answer you get an engaged tone. Vox 3.0 fixes that.
Standard User rn170uk2
(newbie) Tue 26-Aug-25 21:21:48
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: johncc] [link to this post]
 
I'm wondering the same. Used to work fine with old router, but now won't work with that either.
Standard User Taras
(eat-sleep-adslguide) Wed 27-Aug-25 10:52:27
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: rn170uk2] [link to this post]
 
Try the 3006.102.5 version. the x4 branch is near eol.
Standard User johncc
(newbie) Thu 28-Aug-25 19:16:03
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: johncc] [link to this post]
 
update..

i connected the old vodafone supplied router to the line and plugged in a phone.

had dial tone - tried to dial out, as soon as i pressed 1st digit - number unobtainable.

tried to ring number - phone didnt ring just cut off from mobile..

plugged my router with grandstream 801 - able to receive calls but still unable to dial out.

been like this for over week
Standard User Taras
(eat-sleep-adslguide) Thu 28-Aug-25 19:31:32
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: johncc] [link to this post]
 
try microsip on a pc, it should give some more info on whats happening
Standard User Ripshod
(regular) Fri 29-Aug-25 06:28:12
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: Taras] [link to this post]
 
Vodafone's sip service won't connect to microsip. It was hard enough reverse engineering the service to get grandstream devices connected in the first place.
Those affected by this issue should be comparing locations as this appears to be a gateway issue. Town names will do - no postcodes. Gateway IPs would also be useful (available on your router)

Vodafone Full Fibre 500 - My Live BQM (IPv4) - (IPv6)

Edited by Ripshod (Fri 29-Aug-25 06:29:28)

Standard User johncc
(newbie) Fri 29-Aug-25 12:30:28
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: Ripshod] [link to this post]
 
Hi all,

I am located in Abertillery - south wales (01495).

GW IP 212.158.250.40


Cheers

John

Edited by johncc (Fri 29-Aug-25 12:37:50)

Standard User rn170uk2
(newbie) Sat 30-Aug-25 16:58:38
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: Taras] [link to this post]
 
Mine isn't the pro. The one I have is the latest according to
https://www.asuswrt-merlin.net/
Standard User prshires
(newbie) Mon 22-Dec-25 13:40:18
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Re: VOIP with Asus Router - engaged tone on outgoing calls


[re: rn170uk2] [link to this post]
 
Late to the party but maybe this will help. We don't use the phone much. Just my wife, occasionally. She told me the phone wasn't working. She had called work but got the engaged tone but tried on her mobile and got through.

Had a play with the settings. Nothing had been changed. I use an Grandstand HT801.

Almost gave up but found a post on, I think, Reddit that sorted it.

In the FXS Port menu, look for "Use P - Preferred Identity Header"

Mine was set to default. Changed it to "NO".

No more engaged tone and we can make calls. Must be something changed at Vodafone's end as nothing was changed at my side.
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