I've had zero luck getting the phones to register. The heart of my issue is Cisco's nonstandard implementation of SIP.

• Which SIP firmware to use with the 7945/7965? Newer ones (9.x) disable UDP and older ones (8.x) pass strings with illegal characters (parentheses) such as 'Supported: (null),X-cisco-xsi-7.0.1' that force a 401/403 register rejection.

• Can I force an Asterisk-derived PBX like the Switchvox to register Cisco phones given the above? • If so, how should NAT, transport protocol, the overall sip.conf on the Switchvox, and files on the provisioning server be configured? I heard Cisco phones search for SIP responses on nonstandard ports.

Following document explains how to upgrade or downgrade the firmware of an IP phone without disrupting customers production system. We need to follow a couple of easy steps to accomplish this, its valid for CUCM 5.X and above. Hope you find it useful. 1- Download the ZIP file of the firmware on cisco.

• It’s my understanding that Cisco phones can be transformed to SIP in bulk, but would each of my phones require its own SEP(MAC_ADDRESS).cnf.xml file and provisioned individually? To briefly take the alternate point of view, though may well be right in terms of effort, the 8.5.4 firmware (cmterm-7945_7965-sip.8-5-4.zip) is known to work with most configurations of Asterisk I have tried.

However you will NOT be able to make the devices work behind NAT from their media server connection without the SIP Conntrack modification with something like OpenWRT or a local SIP proxy of some sort, due to Cisco's fairly. Reading of RFC 3261.

If you want a shortcut to reprogram a few hundred boxes, I have a hack script using nginx / PHP that you can use. PM me contact info and I can give you some guidance. I'll have the system in front of my again tomorrow. No point in posting the configs unless I have the logs and pcaps too. Firmware used has been 8.5-4 (also have 9.3 lying around). Sip.conf will require me to USB boot and chroot into the Switchvox.

Digium's refusal to allow serial or ssh access to the Switchvox has complicated matters considerably. I've contemplated voiding the warranty and forcibly enabling access. Want to do a packet capture? They force you to use their GUI. I'm using 7945's and 7965's under PBXinaflash (PIAF) which is essentially Asterisk + FreePBX GUI and some modifications without any issues. I don't necessarily agree with others about the SIP woes.

The firmware, even though Cisco is a little less innovative with the SIP firmware when they release it, isn't that bad. However, I would recommend looking into the Chan-SCCP-B project, where you'd load the SCCP firmware (what would normally be used with CallManager) and giving that driver a go. It's a great alternative, more robust, and lots of community support there for bigger implementations as well: • • • •. We've had mostly acceptable results with 8.5.4 running on 79x5's. I use the term 'acceptable' loosely because Cisco 79-series phones lose functionality when they go from Skinny to SIP. The marching orders we give our sales team is to tell customers that Cisco phones can be flashed with SIP firmware and configured to register with our appliance, however depending on the model some features won't survive the conversion. We very often end up providing customers with 79-series phones two quotes, one for flashing their old phones and one for replacing them.

For 7945 and 65 models, the features that behave differently once they're on our system (YMMV of course) are: -No BLF. Speed dial only. -The DND button is a 'mute the ringer' button.

-No auto-answer with speakerphone, ie hands-free intercom calling. -No company directory. Hope this helps.

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