Please follow below instructions:

  • 1. Use the AMR or AMR-WB, or G.722.1 codec.
  • 2. On Android device, please try set the "audioDeviceLayer" parameter of "initialize" function with different values(try value 3 or 4) in order to get the best voice quality. More details please read the SDK user Manual.
  • 3. Use the WIFI or LTE network connection.
  • 4. Use the headset.
  • 5. Use more powerful device.
  • 6. Enable the AEC feature to avoid the echo(please read the "enableAEC" function in user manual).
  • 7. Enable the CNG feature(Please read the "enableCNG" function in user manual).
  • 8. Disalbe the AGC(Please read the "enableAGC" function in user manual).

PortSIP SDKs support below programming languages:

  • JAVA - Eclipse and Android studio
  • Objective-C(XCode)
  • Visual C++
  • C#
  • Xamarin
  • Visual Basic .NET
  • Delphi XE4
  • Javascript/HTML

We have provide two AVI files to show hot to test the refer feature, one for attended refer: Attended transfer; Another one for blind refer: Blind transfer. Just download and use the windows media player watch it.

Yes, We provide customization softphone which built base on our SDK and PortGo Softphone, whether you need pretty GUI and private labeling or other private & specified functionalities of the softphone, we offer services to meet your needs, such as DNS SRV, Auto provision, account balance displaying on the skin, call history and contacts management.

Please send us your requirements and one of our Sales people will contact you soon.


Unfortunately we no longer offer backup DVD as an addition to your purchase; However, you may download all of your purchased products via Downloads at any time.

Please provide your company details with the PO:

  • Company name:
  • Contact person:
  • Tel:
  • Full address:
  • Website:
  • Purchase item(product name, package or version):

Fill the sales form or send your PO to, one of our sales people will contact you soon.

Yes, please contact our sales to get volume discounts.

Customer Service

Please contact Technical Support through our Technical Support.

You can contact Customer Service through our Customer Service.


All PortSIP sales transactions are conducted in US dollars.

We accept payment by Wire transfer, Paypal and Western Union, all invoices are payable in USD funds only. If you have any questions:



We also offer:

  • Upgrades and Technical Support Subscription packages can be added to your development tool purchase. This annually renewing subscription includes all version upgrades and email technical support.


To install your license:
For SDK product, use the setLicenseKey function to set it in your project source code.
For PortGo Softphone, once it pops ups the license window, copy the key and click "OK" button.

You can contact our sales to upgrade your currenlty package to another package just need pay price difference.

Trials and Downloads

We offer the fully-functional trial version for all our software products. 

Select the product you would like to try to download it.

To purchase software during your trial, please fill the sales form or send PO with below details to,

  • Company name:
  • Contact person:
  • Tel:
  • Full address:
  • Website:
  • Purchase item(product name, package or version):

one of our sales people will contact you soon.

We are send the official SDK fils/Software and license key to you via email once the payment is arrived.