No Dhcp option 150 and switch port not on voice vlan
Two Quick questions first of we have call manager version 8. I will like to see if someone can explain a scenario we had at one of our site regarding not having option 150 for our dhcp server, but still the cisco 7941 phones were able to register to call manager but cisco phones did not have some ringers and phone services until we added dhcp option 150 all ringers and phone services worked. I thought u need option 150 for phones to make calls but in this case it didn't phones still register to call manager. Keep in mind this phones were previously register at another site and moved to this new site which didn't have dhcp option 150 for a bit. How is this possible for phones to work somewhat without option 150. Second question we had a phone which was connected to a switchport that only had data vlan but no voice vlan was configured but it still register to call manager and it worked any idea how it worked without having switchport on voice vlan only on data vlan?
Re: No Dhcp option 150 and switch port not on voice vlan
Voice and Data vlan are just an easy way to separate the two, they are not a necessity! remember softphones use the data vlan all the time.
About the option 150, It wont actually get chached, but once the phone has pulled up its config once (using TFTP), it will populate the Call Managers' IP addresses, through the Device Pool .Even though your DHCP pool has no option 150 IP address. (SETTINGS>device configuration>active call manager), in the new subnet, it will still keep pointing at the previsously obtained call manager IP's. this is why it will still function.
Things like ringtone, back grounds and missed call logs, fully depend on TFTP, so that explains why your you were not seeing this working without option 150
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