My company has a CUCM cluster and a small MS Lync implementation (with IP Phones), CUCM controll access to the PSTN and MS Lync also needs access to the PSTN and to be able to communicate with Cisco IP Phones. What is the best way to establish the connection from CUCM to Lync?
Direct SIP Trunk between CUCM and Lync?
CUBE to CUCM and Lync?
I am leaning towards CUBE because all the Cisco documents I read suggest CUBE, however the MS folks are suggesting direct SIP Trunk. Are there any Pros, Cons, for either.
I'm running CUCM 7.1.5 and Lync 2010.
Have tried for three days to configure the sip or direct sip between the two with no luck.
I have opened a Cisco Tac case, the tech checked all the settings on the sip pulled some logs and still no good.
I have researched online and read dozens of docs with different config on both ends but still no communication.
I am wondering if any of you guys have a step by step doc to share.
Our Lync is up and running with IM, we are not using phones on the MS, so I only need to be able to dial and make calls from the Lync client to the Cisco phones.
Please let me know if you have a good doc/ideas to share.
I worked on a case between CUCM and Lync a few weeks back. We just did a direct SIP trunk between CUCM and Lync and it worked flawlessly. Well after some troubleshooting I should say, but we got it to work.
A few things I would point out.
Unless you really need CUBE, you should try to keep things simple. Don't add another point of failure, and more complexity to the topology than needed. You will no longer prone to CUCM bugs, but CUBE bugs as well, and troubleshooting will be more combersone.
Keep in mind placing a CUBE in between is a single point of failure, you could build redundancy around this, but with a direct SIP trunk is much easier.
As well on my implementation, TLS was a must. The customer said Lync only supported TLS connections ( not sure if this is true ) so that would be another thing to consider, your CUBE config should suppport TLS.
I would just try to keep it simple, and if you can set it as a direct SIP trunk to CUCM that would be the way to go.