I'm not sure if this is the kind of support you're looking for, but there's a Canadian Company called SiipQuest (www.sipquest.com). They've got a commercial version of SER.
>Hey All,
>
>Do any of you know of a reliable / knowledgeable source for commercial
>technical support for SER.
>
>If so, we may be interested.
>
>We have worked in the past directly with IPTel, and have discussed support
>options recently with Jiri. He suggested that we ask the fine folks of the
>SER Users mailing list for their suggestions.
>
>Thanks so much,
>
>Darren Nay
>Ionosphere, Inc
>dnay@ionosphere.net
>(864) 678-3158
>
>
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