Most of the Timico staff who have been subjected to my technology staff intro presentation, which is practially all 130 of them over the last 4 years, will have had my spiel regarding the competitive benefits of standardisation (eg IBM PC, GSM phones, SIP). Basically standards increase choice and reduce costs.
Our position regarding the support of VoIP handsets has however been very conservative on the basis that it is impossible for a service provider to provide a quality level of support for a huge range of handsets. Actually this applies in the mobile world just as much as in VoIP although to a lesser extent because GSM is a maturer technology.
I have to say though that as SIP becomes seriously mainstream as the signaling protocol of choice for VoIP my attitude towards handset support is changing. This is bolstered by the availability of a wider range of quality products from market leaders such as Nortel, Cisco and Polycom.
The picture below shows the handsets that we have either already been providing or are in test for production in the near future.
Its horses for courses.