VoIP

SIP method ack

Business SIP Providers
Provider Plan Details Monthly Rate *
Vonage Business SIP Trunking
  • One provider & nationwide coverage
  • Easily integrated into your existing infrastructure
  • More uptime, flexibility and disaster recovery options
$25.00
Details
ClarityTel SIP Trunking Made Clear and Simple
  • Rapid ROI - Flat Rate SIP Pricing
  • Goodbye PRI - No More LD Charges
  • Tier 1 Redundant Network Provider with SLA’s
$19.99
4 trunk min.
Details
VoIPLy Build your phone system online in 5 minutes
  • Unlimited Business Pro Plan
  • Enterprise Disaster Recovery
  • NO Contracts, NO Trunk Fees
$15.00
Details
SIP implements a three-way handshake.

  • The caller sends an INVITE
  • The callee sends an 200 OK to accept the call
  • The caller sends an ACK to indicate that the handshake is done and a call is going to be setup

If the first INVITE message includes a SDP call description, the 200OK includes the callee's SDP.


Created by: oej, Last modification: Wed 26 of Apr, 2006 (21:04 UTC) by marvy
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