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8 posts

Wannabe Geek
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Topic # 185518 26-Nov-2015 07:24
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Hi everyone

This is my first time configuring a router for use with VoIP and I'm at a crossroads where I'm not sure if I'm configuring things correctly or if there is a service issue. 

I have the D-Link setup with a sim card on Spark's 4G network for Internet access (the router is going into a location where a physical connection is unavailable). I have wireless and Internet access configured OK. The router has a RJ-11 port with a phone handset connected. I am running the latest posted firmware.

I can make calls and intermittently I can receive them but more often than not I get an IVR message saying that the person at extension x is unavailable. I have logged the issue with 2Talk - but so far haven't heard anything back.

My configuration of the router is default except for the following settings:

VoIP Line:
Name: voip1
Phone number: <my 2Talk number>
Username: <my 2Talk number>
Password: <my 2Talk password>
Codec Priority:
G792a 1st 20ms
G.711a-law 2nd 20ms
g.711u0law 3rd 20ms


VoIP Profile:
Name: 2Talk
Interface: usb0
Server IP / Domain Name: sip.2talk.co.nz
Port: 5060
Protocol: UDP
Enable Outbound Proxy: ticked
Outbound Proxy Address: sip.2talk.co.nz
Port: 5060
User agent domain:<blank>
User agent port: 5060
URL scheme: SIP
User parameter: none
Initial unregister: ticked (cannot untick)
Register expires: 3600
Session expires: 3600
SIP DSCP: EF - 46
Min-SE 180
Session Expires Refresher: UAC
DTMF Type: InBand (G.711)
DTMF Payload : 101
Enable RPORT: ticked (cannot untick)

RTP Features
RTP Port Lower: 49152
RTP Port Upper: 50000
RTP DSCP: EF - 46

Any help anyone can offer would be appreciated, I'm at my wits end, and not really sure of what all of the settings do. Is there a firewall rule I need to define to get this working?

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29 posts

Geek
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  Reply # 1434931 26-Nov-2015 07:59
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I would check if the router has 'SIP ALG' and if it does turn it off.

Next I'd probably try configure the extension with TCP or TLS, some routers tend to mess with the UDP packets and that's an easy way around it.

You'd need to change the protocol at both the 2 talk end and on your D-Link. I'd recommend looking at the 2talk docs for connecting with those protocols


Try that and come back

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Uber Geek
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Biddle Corp
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  Reply # 1434936 26-Nov-2015 08:24
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Inbound SIP VoIP calls will not work on Spark mobile. There are a number of threads on here detailing this.

It is possible that moving to TCP may possibly fix this, but your best solution is to move to Vodafone.







8 posts

Wannabe Geek
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  Reply # 1434944 26-Nov-2015 08:35
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The router doesn't have SIP ALG - at least that I can find. I changed to TCP and from my limited testing, it has worked everytime so far, I'll keep testing. Thanks



8 posts

Wannabe Geek
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  Reply # 1434946 26-Nov-2015 08:40
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sbiddle: Inbound SIP VoIP calls will not work on Spark mobile. There are a number of threads on here detailing this.

It is possible that moving to TCP may possibly fix this, but your best solution is to move to Vodafone.






Bugger - doing some more testing and it's down again. Might have to investigate a Vodafone sim.

Thanks for all of your help

Hmm, what to write...
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Ultimate Geek
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  Reply # 1434983 26-Nov-2015 09:45
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sbiddle: Inbound SIP VoIP calls will not work on Spark mobile. There are a number of threads on here detailing this.

It is possible that moving to TCP may possibly fix this, but your best solution is to move to Vodafone.






hmm, works fine for me




Matthew




8 posts

Wannabe Geek
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  Reply # 1434985 26-Nov-2015 09:52
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mdooher:
sbiddle: Inbound SIP VoIP calls will not work on Spark mobile. There are a number of threads on here detailing this.

It is possible that moving to TCP may possibly fix this, but your best solution is to move to Vodafone.






hmm, works fine for me


I don't know what I'm missing then, still intermittent access even using direct.telecom.co.nz as the apn

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Uber Geek
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  Reply # 1434986 26-Nov-2015 09:52
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mdooher:
sbiddle: Inbound SIP VoIP calls will not work on Spark mobile. There are a number of threads on here detailing this.

It is possible that moving to TCP may possibly fix this, but your best solution is to move to Vodafone.






hmm, works fine for me


Things could have changed in the last year or so but there is probably at least one thread a year discussing this issue, and the outcome every time has been that it didn't work. I spent quite a bit of time many years ago working on this with Spark and identified exactly why this does happen, but they weren't willing to make changes at that point so it would work.

Mobile networks have to firewall traffic to prevent attacks from such things as uninitiated inbound traffic which could cause chaos. If you look at other networks for example it's not possible to establish even a PPTP VPN on 2degrees.



29 posts

Geek
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  Reply # 1434988 26-Nov-2015 09:54
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I have heard the same actually but never tested.

I use 2Talk over Vodafone mobile every day without issues for reference

Hmm, what to write...
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Ultimate Geek
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  Reply # 1435048 26-Nov-2015 10:53
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sbiddle:
mdooher:
sbiddle: Inbound SIP VoIP calls will not work on Spark mobile. There are a number of threads on here detailing this.

It is possible that moving to TCP may possibly fix this, but your best solution is to move to Vodafone.






hmm, works fine for me


Things could have changed in the last year or so but there is probably at least one thread a year discussing this issue, and the outcome every time has been that it didn't work. I spent quite a bit of time many years ago working on this with Spark and identified exactly why this does happen, but they weren't willing to make changes at that point so it would work.

Mobile networks have to firewall traffic to prevent attacks from such things as uninitiated inbound traffic which could cause chaos. If you look at other networks for example it's not possible to establish even a PPTP VPN on 2degrees.



Just had a look at my two setups. one uses TLS and the other TCP. I don't have one on UDP




Matthew


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