Share this article Share this article ResearchAndMarkets.com's offering. The VoIP access and SIP trunking market remain on pace to become the default connection between on-premises customer platforms and the public switched telephone network (PSTN) and will feature prominently in the digital transformation efforts currently being undertaken by many forward-thinking businesses. This research study discusses market drivers and restraints that are positively or negatively impacting the North American VoIP access and SIP trunking services market, as well as overall market and technology trends. For VoIP access and SIP trunking services, modern on-premises unified communications platforms are already optimized for SIP trunking rather than legacy communications services becomes a significant factor pushing businesses to the service. Likewise, aggressive pricing and feature-rich value-added services encouraging customers to migrate to IP-based voice services.