No, any 3.5mm connector should work. Have tested the itouch with headphones? Is the audio OK? If this works, try plugging the itouch into external speakers using the same cable that is connecting it to your UC520. Any static? If not, this should rule out the cable. The last variable would be the connector on the UC520. If possible, try plugging another device into this connector and see if the problem remains.
I took out itouch from the port and I still heard the crackling sound, then I shut down voice port 0/4/0 and the noise went away, it confirms that it is the voice port. I will move itouch to the fxo port tomorrow and hopefully won't have any noise, will update.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
[toc:faq]CUCM Database Replication is an area in which Cisco customers
and partners have asked for more in-depth training in being able to
properly assess a replication problem and potentially resolve an issue
without involving TAC. This document discusse...