![]() The router will not keep ports open and will re-assign recently used ports to other devices.The Router would not allow SIP packets to pass through to our SIP Proxies in any form.No separate field for Auth ID which means that a limited number of users can use this device with the OnSIP service. Please see our Unidata knowledgebase pages for more information. These phones have multiple SIP RFC violations.Some versions of Sonus applications on some Sonus products have RFC 2833 DTMF interoperability issues with our service.Includes a SIP Application Level Gateway (ALG) which always substitutes the external IP address for any internal IP address in SIP requests. ![]() Dialing a non-existent extension renders the phone non-functional and a reboot is required.There is no identifiable field for outbound proxy, which means outbound calling to the PSTN does not work.Unfortunately these companies are not experts in SIP and implement these gateways incorrectly. Many router manufacturers for instance have implemented what are known as SIP ALGs, application level gateways, that attempt to rewrite the SIP packets in order to traverse NATs. Incompatible hardware and software is that which tries to change the packet information but does so incorrectly. While the list of routers and firewalls known to work is far too long for us to practically maintain, routers from Cisco, Juniper, Linksys, D-Link, Apple and Edgebox among many others are known to work well. All packets coming from OnSIP are in response to packets that originated on your network. OnSIP Interoperability TestAll Testing of the Aastra 6739i was done on firmware version 3.0.1. The phones inside the network make the initial communication out to OnSIP and therefore open the port. This is all that is necessary for compatibility with OnSIP and sending extra codecs can cause problems with packet. Note: No ports are required to be opened in order for the OnSIP Hosted PBX to work. Phones are located behind a single NAT server on your internal network.Any SIP firewall has been deactivated (this is a function on some routers).Any SIP ALG has been disabled (this is a function on some routers).At just 18.95 per month per user, OnSIP has proudly provided reliable, low-cost cloud phone service to thousands of businesses for more than 15 years. Generally, we have found that OnSIP works great with all sorts of routers and firewalls so long as: Reliable Cloud VoIP Tailored to Your Business. Please see Phone Configuration for phone configuration options. RFC 4961 - Symmetric RTP / RTP Control Protocol (RTCP).RFC 3515 - The Session Initiation Protocol (SIP) Refer Method.RFC 3264 - An Offer/Answer Model with the Session Description Protocol.RFC 3263 - Session Initiation Protocol (SIP): Locating SIP Servers.RFC 3261 - SIP: Session Initiation Protocol.RFC 2833 - RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals.While the OnSIP service supports a broad range of SIP features and functionality, any device which supports and is compliant with the following minimum requirements will work: SIP RFC Support Recommended Phones and Routers can be found in our Purchasing Guide.
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