Both Fring and Nimbuzz seem to slow my cell down, at least when they are in memory, but they both work well and I go back and fourth between which is better. I like Nimbuzz's UI and codec better, but Fring seems to use less bandwith. I with that SIP calling to numbers not on your Fring contacts was a little more straight forward.
I find Nokia's built-in SIP stack to be superior to pretty much everything else out there. I removed all codecs but iLBC and can place calls in pretty much every environment out there. It sure beats routing calls via Fring's servers in Israel.
VladS
Mobile Phones: Nokia E72-2 (3G/GSM/VoIP), Nokia E71-2 (3G/GSM/VoIP), Samsung BlackJack II (GSM/3G)
Mobile Data Cards: Novatel MC950D, Huawei E220, ZTE MF668
Postpaid SIMs: CA: Fido - US: AT&T - FR: SFR
Prepaid National SIMs: DE: Aldi, Fonic - AT: yesss! - RO: Orange, Vodafone - UK: O2 & T-Mobile - US: AT&T & T-Mobile
Prepaid International SIMs: eKit, Sim4Travel
Dead Prepaid SIMs: United Mobile +44, United Mobile +423, ICQSIM and 09
Fring and Nimbuzz get around a ton of SIP blocking. Until recently, it worked in the the city listed in my handle on both networks. It still works on the competitor. I'm playing with trying to get a VPN working on a Nokia, but have had some problems. I'll look at the iLBC codec alone and see how that works. Question: can I just disable all the codecs except this one in Asterisks or do I need to hack something on the phone. I presume the answer is server side is fine, but I'm a newbie with Asterisks.
You can do it in both Asterisk and the phone. For the phone you need the Nokia SIP VoIP Settings application. For the E71, since it uses VoIP implementation 2.2, you need version 1.2 of the app.
VladS
Mobile Phones: Nokia E72-2 (3G/GSM/VoIP), Nokia E71-2 (3G/GSM/VoIP), Samsung BlackJack II (GSM/3G)
Mobile Data Cards: Novatel MC950D, Huawei E220, ZTE MF668
Postpaid SIMs: CA: Fido - US: AT&T - FR: SFR
Prepaid National SIMs: DE: Aldi, Fonic - AT: yesss! - RO: Orange, Vodafone - UK: O2 & T-Mobile - US: AT&T & T-Mobile
Prepaid International SIMs: eKit, Sim4Travel
Dead Prepaid SIMs: United Mobile +44, United Mobile +423, ICQSIM and 09
Used Fring for a decent canada to thailand call via skype. It ok, except it has to be running. If you are on a SIP enabled Nokia setting up a Gizmo account on it is not a bad option.
I use Fring for Skype calls. From Hong Kong, South Africa to Czech Republic and Philippines. From Czech Republic to Philippines. Normally Nokia E61 or E71. Using UMTS or HSDPA connection. Voice quality is good.