sip-v-isdn

SIP Trunking v ISDN

ISDN Trunking SIP Trunking
Requires Expensive Circuits Requires Cheaper Data Circuits
Typical Call Rates Apply Cheaper Calls Rates Apply
PBX Requires Line Card for additional circuits No Line Card required
ISDN line down: Lose incoming voice Data circuit down? Calls can be re-routed over backup connection
Works with modern IP-PBXs (line card required) Works with modern IP-PBXs (no line card required)
Works with old PBXs (line card required) Works with old PBXs (SIP-ISDN gateway required)
Spare connectivity capacity goes unused Spare connectivity capacity can be used for internet access, WAN connectivity
ISDN connectivity prices are likely to stay static Data connectivity prices are likely to continue falling
Likely to be discontinued over next ten years Likely to become the new standard for voice trunking

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