How to manually insert the provision URL in a Linksys
You can set your IP phones to retrieve the provisioning URL automatically via DHCP 'option 66'. This is recommended for larger networks. For more information, see the DHCP option 66 configuration guide. This support was added in firmware versions 6.1.5a.
To provision Linksys SPA Phones please see the this guide: Provisioning a Linksys SPA 901, 921, 941, 922, 942, 962 for 3CX Phone System
SIP Phone Configuration Guides (Preferred) 
- 3CXPhone for Android (Provisioned)
- 3CXPhone for iPhone
- 3CXPhone for Windows
- CISCO SPA 501G, 502G, 504G, 508G, 509G, 525G (Manual configuration)
- CISCO SPA 501G, 502G, 504G, 508G, 509G, 525G (Provisioned)
- How to auto-provision IP phones with DHCP 'option 66'
- GrandStream GXP-1450, 2110, 2120 and GXP 2100 (Provisioned)
SIP Phone Configuration Guides (Supported) 
- GrandStream GXP-2000 (Manual configuration)
- GrandStream GXP-2000, 280, 1200, GXP 2010 and GXP-2020 (Provisioned)
- GrandStream HandyTone 386 ATA
- GrandStream HandyTone 486(487),286(287) ATA
- Linksys 3102 ATA and Fax - T38 Fax Pass-through
- Linksys SPA 901, 921, 941, 922, 942, 962 (Manual configuration)
- Linksys SPA 901, 921, 941, 922, 942, 962(Provisioned)
- Polycom KIRK Wireless Server 300
- Polycom SoundPoint IP 320, 321, 330, 331, 430, 450, 550, 560, 650, 670 (Manual configuration)
- Polycom SoundPoint IP 320, 321, 330, 331, 335, 450, 550, 560, 650, 670(Provisioned)
- Polycom SoundStation IP6000
- Yealink T20, T22, T26, T28 (Manual configuration)
- Yealink T20, T22, T26, T28 (Provisioned)
SIP Phone Configuration Guides (Tested) 
- Aastra (67)51i, (67)53i, (67)55i, (67)57i (Manual configuration)
- AAstra (67)51i, (67)53i, (67)55i, (67)57i (Provisioned)
- Aastra SIP-DECT
- CISCO 7940
- Counterpath Bria
- Linksys SPA-901
- Nokia E65 / E71 / N95
- Siemens C470IP
- Snom 300, 320, 360, 370, 820, 821, 870 (Manual configuration)
- Snom 300, 320, 360, 370, 820, 821, 870 (Provisioned)
- SNOM M3
- X-Lite 3.0
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