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Old 10-03-2008, 08:01 AM   #1 (permalink)
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I connect to WiFi on my 8320 easily and get great service, when on WiFi I get UMA come up, firstly, what does UMA mean, and also when in this mode I cannot receive phone calls , they go direct to voicemail. Am I doing anything wrong? Appreciate any help on this???
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Old 10-03-2008, 11:46 PM   #2 (permalink)
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UMA is using the wifi to send and receive calls. I don't remember the technical name for that abbreviation. In the US, I know Tmobile has a service where you can do this WIFI calling and if you sign up for the plan, it helps save you minutes.

Seeing that your service is Orange, I don't know if they offer the same thing. If they don't, that could be the reason why your phones are being forwarded to voicemail.
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Old 10-04-2008, 12:40 AM   #3 (permalink)
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Lightbulb Uma

UMA = Unlicensed Mobile Access
It allows calls between WiFi and GSM.
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Old 10-04-2008, 02:14 AM   #4 (permalink)
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Orange does offer UMA service. Otherwise UMA wouldn't come up on the device. As to why it goes straight to voicemail, I don't know. It should work just as if you were on EDGE. Have you contacted Orange with that issue? There are lots of factors that play into UMA problems. Router, ISP, etc.
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Old 10-04-2008, 07:56 AM   #5 (permalink)
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I have a similar problem but the calls get through but sometimes they can be appalling. I just turn off my connection to a Wifi network so the phone uses gprs instead (though a more efficient answer would be much appreciated) not sure if it helps but there is another thread with a very similar question with the solution...

Quote:
Originally Posted by dansm77 View Post
It seems that UMA is a bit flakey, along with Orange customer service. Anyway, you can turn off UMA by setting the device to always connect to the mobile network, rather than wifi, i.e. Options -> Mobile Network -> Connection Preference, then select Mobile Network Only

Last edited by Theory : 10-04-2008 at 07:57 AM.
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Old 10-04-2008, 09:23 AM   #6 (permalink)
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There are some wifi router settings you should pay attention to in order to make it work on UMA.

Quote:
In order for IPsec to work, the following ports need to be allowed through the firewall in both directions:

* UDP port 500 (Internet Key Exchange or “IKE”)
* UDP port 4500 (IPSec/IKE NAT-T)

Many consumer-grade routers, including the T-Mobile branded Wi-Fi routers, include a simple check-box that will enable IPsec communications. This option is typically named ‘Enable IPsec passthrough’ or something similar.
For users of advanced corporate firewalls or home-built firewalls (typically running a UNIX-like operating system), IPSec may also require explicit rules to allow the following two protocols (independent of port) through the firewall:

*
o IP protocol 50 (Encapsulating Security Payload or “ESP”)
o IP protocol 51 (Authentication Header or “AH”)
Got it from here.
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Old 10-04-2008, 11:51 AM   #7 (permalink)
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SPI Firewall is another one that can prevent UMA connections from working properly.
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Old 10-05-2008, 04:51 PM   #8 (permalink)
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Quote:
Originally Posted by leves View Post
I connect to WiFi on my 8320 easily and get great service, when on WiFi I get UMA come up, firstly, what does UMA mean, and also when in this mode I cannot receive phone calls , they go direct to voicemail. Am I doing anything wrong? Appreciate any help on this???
Have you tried changing the connection preference to Wi-Fi Preferred?
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