The above however would need to be applied to your VoIP dial-peers which by looking at your config, the class codec already is.
Secondly I noticed you have no transcoding enabled, whilst in quite a few cases this is not needed, I have made it a habit myself to add it into the system, if you are using CCA to configure the system, which by the looks of it most of it was configured with CCA, or a CCA template, then use CCA to add transcoding in as you may find this might actually be needed with your SIP trunk depending on what interaction is happening between the system and your SIP trunk provider.
Manual transcoding can be applied by using the following code (NOTE: This code will not be within OOB guide lines, if you want it within OOB guidelines then please modify to operate within the guidelines specified in the OOB documenation).
sccp local (Interface or BVI) sccp ccm 10.1.2.1 identifier 1 version 7.0 sccp ! sccp ccm group 1 bind interface XXXXXXXXXXXXX associate ccm 1 priority 1 associate profile 1 register transcode
dspfarm profile 1 transcode codec g711ulaw codec g711alaw codec g729ar8 codec g729abr8 codec g729r8 codec g729br8 maximum sessions 2 <---------------- Put there however many sessions you need for transcoding associate application SCCP
sdspfarm units 2 sdspfarm transcode sessions 2 sdspfarm tag 2 transcode
In practice if you are going to continue using CCA to manage the system, then you should really use CCA to enable it, however granted that at times access to the system remotely using CCA is not always workable or can be done, so the above code is only if you are needing to do it manually.
As for the SIP registration status, this is quite normal if you have not done the following:
You need to apply the following on all DN's "number 206no-reg primary" the no reg primary will prevent this from carrying out SIP registration, however do not apply this to your SIP trunk registration DN if you use one.
Also make sure all your POTS dial-peers also have the "no sip-register" command, by the looks of it that is already applied, but it is good to give it a once over and make sure that is the case.
Right now this is all I can think of, I hope it helps you to resolve the problem one way or another :)
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voice service voip allow-connections h323 to h323 allow-connections h323 to sip allow-connections sip to h323 allow-connections sip to sip no supplementary-service sip moved-temporarily no supplementary-service sip refer sip bind control source-interface Loopback0 bind media source-interface Loopback0 <= CHANGE THIS TO YOUR WAN INTERFACE
In addition to the awesome tips posted already - can you let us know if there is any firewall in front of the UC500? We have seen this in the past with SIP trunk traffic not being allowed through a firewall.
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