I have connected SX20 in one switch port and configured a voice vlan on the switch port leaving the Data vlan to default, sx20 is not picking the IP from voice vlan , when i changed the default vlan 1 to vlan 22 my actual DATA vlan than SX20 took ip from dhcp.
It is but the voice vlan might not be enabled in certain versions (depending on what version you are running). I would look at the configuration on the SX20 and search for Voice vlan in it and make sure its enabled.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
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