All Nokia E Series and some other Nokia models support VoIP (SIP) natively, i.e., a SIP client is integrated into their firmware. See the below link to the Forum Nokia page for a list of which models support VoIP natively, and which Nokia S60 VoIP Release number is included when a particular model’s firmware is updated, or not, as the case may be: http://wiki.forum.nokia.com/index.php/VoIP_support_in_Nokia_devices .
However, some newer Nokia models
which run on the Symbian 3 operating system also support VoIP; unfortunately, so far, they are not listed on that Nokia Wiki Forum page, so you would have to check each model’s specifications to make sure it does actually have a SIP client.
Whether the updating of a model’s firmware changes the Nokia S60 VoIP Release number or not, it is always advisable to install the latest firmware as improvements to VoIP performance can result anyway.
Nokia phones using VoIP Rel 3.1 and later:
None of the settings in the SIP client can be accessed without using a Nokia SIP VoIP Settings Application. That application is mentioned further in the following paragraphs.
When using the Nokia SIP client over a 3G / HSDPA connection the call quality can be vastly improved if the G.729 or iLBC codecs are used. However, the Nokia SIP client does not give the user access to the codec settings, unless you install a “Nokia SIP VoIP Settings Application” on the phone.
Here is a link to the Forum Nokia page about the Nokia SIP VoIP Settings application which suits Nokia S60 VoIP Releases 2.2, 2.3, 3.0 or 3.1 and Nokia’s which run on the Symbian 3 Operating System: http://www.forum.nokia.com/info/sw.nokia.com/id/d476061e-90ca-42e9-b3ea-1a852f3808ec/SIP_VoIP_Settings.html
SIP VoIP settings applications Easily mаkе аnԁ modify VoIP settings οn Symbian аnԁ S60 devices Thе SIP VoIP Settings applications enable уου tο mаkе VoIP settings οn Symbian аnԁ S60 devices supporting Nokia S60 VoIP Release 2.2, 2.3, 3.0, οr 3.1. Once уου’ve mаԁе settings, уου саn export, transfer, аnԁ import thеm tο οthеr Symbian οr S60 devices running a SIP VoIP Settings application.
Thе Nokia SIP VoIP Settings applications enable уου tο define thе parameters fοr a VoIP profile, whісh аrе nοt accessible through аnу standard feature οf Symbian οr thе S60 platform. Thе applications enable уου tο mаkе VoIP profiles аnԁ modify existing ones. Within a profile, уου саn mаkе аnԁ modify VoIP parameters, such аѕ speech-codec settings, аnԁ NAT-firewall-traversal settings, such аѕ SIP field- specific settings. Yου аƖѕο саn υѕе аn OMA Client Provisioning document tο import аnԁ export VoIP profile settings. Together, those capabilities enable уου tο easily set up devices fοr testing VoIP providers.
The Nokia SIP VoIP Settings applications also permit the you to get access to VoIP parameters, other than just the abovementioned codecs. For example, if you are having problems making or receiving calls the option to use a STUN server can be very useful.
“Nokia Configuration Tool” for Windows7/XP
Anyhow, if you feel uncomfortable with the Phone interface setting your VoIP there is a “Nokia Configuration Tool” PC (Windows7 / Windows XP) application to manage VoIP and other settings on Nokia E and N Series phones.
Nokia Configuration Tool supports Nokia Symbian phones:
Nokia E51, Nokia E52 PR 2.0 and newer, Nokia E55 PR 2.0 and newer, Nokia E60, Nokia E61, Nokia E61i, Nokia E62, Nokia E65, Nokia E66, Nokia E70, Nokia E71, Nokia E72, Nokia E75 PR 2.1 and newer, Nokia E90 Communicator, Nokia N97, Nokia N97 mini, Nokia N8, Nokia E7, C7, C6, E5 phones.
NOTE: To use the Nokia Configuration Tool with Nokia E52, Nokia E55, and Nokia E72 phones, install the appropriate phone service pack that is available at the Nokia website. Also support for many other models such as Nokia X6, Nokia N86 8MP, Nokia 5530 XpressMusic, Nokia 6124 classic, Nokia N82, Nokia N95 8GB, Nokia N95-3 NAM, Nokia 5700 XpressMusic, Nokia 6110 Navigator, Nokia N95, Nokia 6790 slide, Nokia 5730 XpressMusic, Nokia 6650 fold, Nokia N96, Nokia 5233, and more.
You can edit and store settings on a compatible PC and transfer them to your phone(s): http://europe.nokia.com/get-support-and-software/download-software/nokia-configuration-tool.)
Sound off in the comments if you have other NOKIA mVoIp tips and tricks to share.