An outbound number will not be dialed unless it matches the Dial Plan of the Phone, ATA, or PBX. This article has useful links and resources for understanding Dial Plans by Manufacturer.Dial Plans are sequences of characters used to translate dialed numbers into outbound dial strings. Dial Plans can be used as filters; to allow, disallow or manipulate dialed numbers. If a dialed number in the device matches a set Dial Plan, the device will then transmit the dialed numbers outbound.Dial Plans can be used to prevent calls to certain destinations, such as 411 and International Numbers, or to add in an area code for 7-digit dialing. Dial Plans look very similar from manufacturer to manufacturer, but are not always the same. Most dial plans are based on the (MGCP RFC 3435) Dial Plan but have modifications for various reasons.Yealink Dial PlansStandard Yealink Dial Plan1xxxxxxxxxx[2-9]xxxxxxxxx[469]11You can find more detailed dial plan information in the Yealink Administrative configuration guide.Cisco Dial PlansStandard Cisco Dial Plan(*xx.|[3469]11|0|00|[2-9]xxxxxx|[2-9]xx[2-9]xxxxxx|1xxx[2-9]xxxxxxS0|<:1>[2-9]xx[2-9]xxxxxxS0|xxxxxxxxxxxx.)Cisco Dial Plan Documenationhttp://www.cisco.com/c/en/us/support/docs/collaboration-endpoints/spa901-1-line-ip-phone/108747-pqa-108747.htmlPolycom Dial PlansStandard Polycom Dial PlanxxT|0T|011xxx.T|1[2-9]xxxxxxxxx|[2-9]xxxxxxxxx|[0-9]xxxT|*xx1[2-9]xx[2-9]xxxxxx|099xxxxxxx.TPolycom Dial Plan Documentationhttp://support.polycom.com/global/documents/support/technical/products/voice/Understanding_Digit_Maps_Tech_Tip.pdfVtech Dial PlansThere are three dial plans per account on Vtech Phones. The following are the default dial planssip_account.1.dial_plan="x+P"
sip_account.1.call_restrict_dial_plan=
sip_account.1.emergency_dial_plan="911|933"Vtech Dial Plan Documentation: Page 52https://cdn-media.vtechphones.com/media/p/document2/products/%7BC1D87BF6-0788-4541-A61B-F45AC6D29EB9%7D/VTech_VSP736_Admin_Provisioning_Manual-Rev-2.pdfGrandstream Dial PlansStandard Grandstream Dial Plan{ [349]11 | [2-9]xx[2-9]xxxxxx | 1[2-9]xx[2-9]xxxxxx }Grandstream Dial Plan Documentationhttp://www.grandstream.com/support/faq/product-related-questions/gxv3140-ip-multimedia-phone/making/receiving-calls