[pjsip] UMTS Troubleshooting

Angelos Karageorgiou angelos at unix.gr
Tue Feb 12 06:50:34 EST 2008

Did you try STUN ? it is for these weird cases

Tzury Bar Yochay wrote:
> Hi,
> I got my pjsua_wince working great over WiFi.
> However, when switching to UMTS and try to connect to asterisk under 
> the following layout:
> Asterisk on <>
> Workstation on <> with sjphone (ext. 200)
> Both behind a router with certain public IP.
> HTC device with pjsua_wince installed (ext. 205) and configured 
> properly to use the public IP and to call the extension.
> I also set DMZ on the router to eliminate NAT Issues.
> I observe the following symptom:
> Pressing call button on pjsua_wince makes the SoftPhone on the 
> workstation to ring but pressing answer on the softphone don't cause a 
> start of call.
> By running wireshark I can see that there is a query from the router 
> IP which reads "Who has 10.220.y.z" which I assume is the private IP 
> that the HTC got from the GSM provider and since 10.220.y.z is not a 
> "legal" IP it search inside the lan which ofcourse has no such address.
> In short,  I suspect that the GSM provider provide the internal IP 
> instead of the public one which preven the ACK from reaching the 
> end-point.
> This might be beyond the scope of pjsip but I wonder if anybody have 
> struggled with this ip-translation issue.
> Thanks in advance
> Tzury
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