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Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
OnWhatsApp - Create your online catalog, receive orders on WhatsApp 🛒
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
WhatsApp Chat for Shopify - Convert website visitors into customers with WhatsApp Chat
Sipnetic - Sipnetic is a free VoIP softphone based on the SIP protocol.
Slack with your Users - Speak to your app's users entirely within Slack