Microsoft Office Communications Server

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OCS is somewhat unique in the SIP space because it only supports TCP for transport instead of UDP, which is primarily supported by just about every SIP implementation. There are a few solutions out there to address this, but you have two basic options:

- Implement TCP support in your SIP stack/device. If it's open source, you have the choice. If not, beg your vendor.

- Implement a SIP Proxy that understands all transport protocols. The SER/Kamailio family is a popular choice for this approach. YMMV.

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