How to Set DTMF in asterisk

How to change DTMF Setting on the fly in sip.conf or extensions.conf in asterisk.
Its common to have multiple DIDs from VoIP service Providers and those DID needs different DTMF settings. You can change the DTMF in asterisk no matter how the SIP trunk is configured.
In your routing block (Usually in extention.conf) your can add a line
[code] exten => DID.,n,SIPDtmfMode(inband)

Example you have two DIDs

19856785635 and 8665298546 and one support RFC28cc and other one supports inband
[code] exten => 19856785635 ,n,SIPDtmfMode(RFC2833)
exten => 8665298546 ,n,SIPDtmfMode(inband)
[/code] In asterisk pbx you might have to use extensions_custom.conf

Post your question in comment if you need more help.

VoIP Faqs

Here are most Frequently Asked Question about VoIP. Most common things you should know.

VoIP PBX for Large Businesses

One of the biggest benefits of VoIP for large businesses is owners can easily ditch their costlier traditional PBX systems. This is because IP PBX can also work very similarly to the network (i.e., trunk lines and extensions) they’re used to. The only difference is that IP PBX allows owners to send voice and audio data over the Internet.

When you use VoIP PBX,

1. You don’t need to be highly dependent on your telephone company, which is basically the setup with a traditional PBX.   You have a lot of control over the entire telephone system employed in your business.

2. You’re provided with several options. You can run VoIP virtually usually using a soft phone; or your provider can provide you with additional equipment, such as SIP phone, router, and VoIP gateway.

3. You can manage all your telephone systems. In fact, you don’t have to assign a telephone operator. You can be the one to keep track of the network by means of a graphical user interface you can now access remotely or online. Moreover, you can use the same panel in order to fine-tune or upgrade any or all of your telephone systems.

4. You can save up a lot of costs. You don’t get to manage only the telephone systems in your building but also those of your other branches, even the ones overseas. You can save a lot of costs by matching telephone area codes or encouraging PC-to-PC calls.

 5. You can increase productivity. You can now further customize VoIP networks to perform additional functions. For example, you can configure it to pull out records in your system whenever a customer calls.

VoIP for Small and Home Businesses

In spite of the popularity of VoIP, there are still a couple of business owners who are reluctant to adopt it. Usually, these are small and home business owners who believe they don’t have enough financial resources to run a VoIP network. Others charge the apprehension to lack of technological experience.

VoIP isn’t a perfect system. It has its own loopholes and glitches. In fact, it may not be as cheap as others would like to think. However, the benefits small and home business owners can take advantage are way more than the cons:

It helps you cut back on communication expenses. As mentioned, not all VoIP systems are cheap; that’s why you need to compare packages. In general, however, VoIP allows you to pay monthly fixed fees or per-minute charges for your long-distance phone calls. You can also find reasonably priced plans with unlimited overseas telephone calls.

For the equipment, plenty of providers can already give them in exchange for a lock-in contract. If you don’t want to be tied down to one provider, you can purchase them both online and offline. Because of stiff competition among suppliers, VoIP phone costs can be as low as $100.

It’s easy to expand your business. Almost always, VoIP upgrades are completely for free. You will simply be notified whenever new updates are available. Moreover, when you need to add additional phones or change your network, you can do so through a GUI. You don’t have to request for a technician, which is additional cost for you.

You don’t have to miss out any calls. You can now configure VoIP to redirect calls not only to another landline number but also to your mobile phone. You can also activate your voice mail and access messages anytime and anywhere.

You can run your business like a huge enterprise. VoIP offers auto-attendant, which provides a professional-sounding system to your network (it’s the one that says, “Press 1 for customer service,” etc.). You can also set up limited conference calls.