Fallback to UDP if TCP fails whan connecting to a provider

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What steps will reproduce the problem?
1. Register where TCP connections to port 5060 are blocked
2. Timeout
3.

What is the expected output? What do you see instead?
I'd like to see an option to try to fallback to UDP should TCP fail after a 
user defined amount of times and vice versa (fall back to TCP if UDP fails), 
and if issue #116 is resolved, also on a per-provider basis.

What version of the product are you using? On what device/operating system?
Sipdroid 1.5.5 beta, Nexus One 2.2 FRF91 CM6.0.0-RC2.

Which SIP server are you using? What happens with PBXes?
It's not a server issue, but for example euteliavoip.com doesn't always accept 
TCP connections.

Which type of network are you using?
Tried on 3G and WiFi.

Please provide any additional information below.
It's an enhancement request, not a defect.

Original issue reported on code.google.com by marcu...@gmail.com on 31 Jul 2010 at 3:37

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Original comment by pmerl...@googlemail.com on 2 Aug 2010 at 3:31

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

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If the server does not work reliable it is not the client that needs to be 
extended.

Original comment by pmerl...@googlemail.com on 3 Aug 2010 at 7:10

• Changed state: Invalid

[GoogleCodeExporter]

Well, this enhancement is not just to compensate a server problem, but a 
network problem.

To be honest I could verify that it was not eutelia's problem but my router's.
This happens on my router: it sometimes runs out of TCP routing table space and 
doesn't route any new TCP connections. In this case, although I prefer TCP 
because it offers a much more reliable connection, I'd like Sipdroid to connect 
via UDP even if it's usually worse because I'm reachable in that case.

Original comment by marcu...@gmail.com on 4 Aug 2010 at 11:36