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Voice vlan and access vlan

I have a situation where I have configured switchport to access access vlan 4 and voice vlan 12. Need less to say I have all the necessary vlan configured. I am using Sangoma S500 phones. So When I plug the phone in Its pulling ip from the Data/access vlan.

Phones are capable of doing lldp and I have that enabled. I have tried using being that enabled as well but no different result being seen.

I know this work for Cisco phones but why not any other phones. I have seen similar issue on aastra phones. Due to short time to do research I interchange the vlan value and it worked. I don't want to do this for learning purposes.

Switch is cisco 3750G and below is the switchport configuration.

"switchport access vlan 12
 switchport mode access
 switchport voice vlan 3
 switchport port-security maximum 2
 switchport port-security maximum 1 vlan access
 switchport port-security violation restrict
 switchport port-security
 srr-queue bandwidth share 1 30 35 5
 priority-queue out
 mls qos trust device cisco-phone
 mls qos trust cos
 auto qos trust
 spanning-tree portfast"

Hopefully I will get this clear with your help.

* VLANVoice Over IP

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Found the solution
Voice Over IP
Voice Over IP

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN). Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).

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