How does 2 sets of SX20 to have a conference by dial SIP address thru Internet

[matthewik.lee]

Dears, the customer offer us their SX20 sip address like sx20@xxx.com, how may I set my side SX20 to have a conference call by dial this SIP address?

Thanks a lot. Matthew

[Jens Didriksen]

Is your system "stand-alone" or registered to VCS or CUCM?

If stand-alone, it must have software version TC4.2 or later and you should be able to dial the given URI.

If registered with CUCM, then I believe this has to have software version 9.x or later as I don't think CUCM supported URI dialling prior to that.

Call protocol in both scenarios has to be set to SIP obviously.

/jens

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[matthewik.lee]

Hi Jens,

Our SX20s all are standalone, running H.323 among them, and the version is TC5.x. In this case, you said I should be able to dial the given URI?

How my side SX20 could RESOLVE their URI and get connected, could you explain its working flow for me. Thanks.

Matthew

[Jens Didriksen · Accepted solution]

It'll do a DNS lookup, so if the people you are calling have the correct SRV records in place then it'll work. If they don't, or if their system is not registered to a SIP proxy, well, then it won't work.

We use a VCSC/VCSE combo, and have both h.323 and SIP SRV records in place which point to the FQDN of the VCS-E sitting outside the firewall..

You should really consider upgrading your system though, latest version is TC7.3.2, but I would wait until TC7.3.3 is released some time in May.

If you don't have a valid service contract in place, then you can obtain a free upgrade by contacting Cisco TAC and reference this security bulletin; http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140926-bash - or even this one: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140409-heartbleed scroll down and expand "Obtaining Fixed Software", then expand "Customers without service contracts" and follow the instructions.

/jens

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