Page History

The 

• Associate a Fully Qualified Domain Name (FQDN) with each

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  signaling zone

• Track the availability of peers specified by FQDNs by sending OPTIONS ping requests

• FQDN received in Contact headers of mid-dialog SIP messages

• FQDN received in contact header of 3xx response to INVITE
• FQDN received in Refer-To header of REFER message
• FQDN received in contact header of 3xx response to SUBSCRIBE
• FQDN received in Route header of INVITE
• Sending FQDN in contact header of the messages sent by the

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Track Availability of Peers Specified by FQDN

The

• Resolves FQDN of an IP Peer to the IP addresses of its SIP servers using A/AAAA queries to DNS.
• Periodically pings each server of the IP Peer and checks if the peer is available, and set the Request-URI of the outgoing Options ping requests to the FQDN of the IP Peer being pinged.
• Displays the current status of a FQDN IP peer. When queried from the CLI, the

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  classifies the FQDN IP peer as "up" if any of the peer’s servers are available. Alternatively, it classifies the FQDN IP peer as "down"  if all of the peer’s servers are unavailable.
• Raises an SNMP trap (and alarm), and adds it to the Address Reachability Service (ARS) blacklist if a peer specified by an FQDN becomes unavailable. Raises another 'clearing' trap (and alarm) when the peer becomes available again. The

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  also passes the FQDN, port and zone of the peer in these traps.
• Raises/clears the traps when individual IP endpoints that an FQDN resolves becomes unavailable/available. The

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  passes the IP/port of the endpoint, FQDN and zone of the corresponding peer in these traps.
• Picks up any change to the peer’s set of servers published through DNS as soon as the corresponding DNS record expires.
• While placing calls to the Peer, the

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  checks the Peer's status in ARS. The

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  does not place calls to a Peer-Servers which are down.
• Removes any Peer-Server that was earlier blacklisted by Pathcheck and is no longer a part of the peer’s set of servers in DNS.

Support Targets Specified by FQDN

When the

• If the FQDN in the Refer-To/Contact of 3xx header matches the Zone Level FQDN of

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  , the INVITE/SUBSCRIBE is sent out to the destination specified by the PSX.
• If the FQDN in the Refer-To/Contact of 3xx header does not match the Zone Level FQDN of the

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  and if the "Route using Received FQDN" flag is disabled, the INVITE/SUBSCRIBE is sent out to the destination specified by the PSX.
• If the FQDN in the Refer-To/Contact of 3xx header does not match the Zone Level FQDN of the

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  and if the "Route using Received FQDN" flag is enabled, the INVITE/SUBSCRIBE is sent out to the destination specified by the Refer-To/Contact header (that is, to the IP address that DNS resolves it to). The destination of the INVITE/SUBSCRIBE is not affected by the value of the ‘Preserve Ingress R-URI Domain Name’ flag.
• For a redirection response, the modified behavior is applied only if the ‘Force Re-query for Redirection’ flag is enabled in the IPSP.

FQDN Support in Route Header

The

• If the FQDN in topmost route header matches zone level FQDN and the parameter useRouteset is set to "received", the

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  pulls the route from the route set and routes the INVITE to PSX returned destination gateway.
• If the FQDN in topmost route header does not match configured zone level FQDN, and if useRouteSet is set to “received”, the

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  resolves the received FQDN using DNS look-up, and routes the INVITE to the resolved destination.
• If useRouteSet’ is not set to "received", the

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  routes the INVITE to PSX returned destination gateway.

Respond to Incoming OPTIONS Pings

The

• Max-Forwards is zero.
• If userinfo in Request-URI and Route Header is absent and the hostname in RURI matches either the domainName of the local signaling zone or the IpAddress of any sipSigPort in the Zone.

Support Sending FQDN in Contact Header

If the flag useZoneLevelDomainNameInContact is enabled, the

• Initial INVITE and its responses (18x,2xx,4xx-6xx)
• In Dialog messages (OPTIONS, REFER, SUBSCRIBE, NOTIFY, MESSAGE, INVITE, PUBLISH, UPDATE) and their responses
• Out-of-dialog requests (NOTIFY, SUBSCRIBE, OPTIONS. MESSAGE, PUBLISH, REFER) and their responses

• All requests and responses relayed in registration context (SUBSCRIBE, REFER, NOTIFY and so on)

• Register request (not applicable for REGISTER response)

If passCompleteContactHeader transparency flag is enabled, contact header is passed transparently irrespective of setting of flag useZoneDomainInContact.

If transparency for contact header is enabled via IP Signaling Profile flags or by using newly introduced Header Transparency Profile, then it will take precedence over the Use Zone Domain in Contact flag.

Unique FQDN for Video

A Lync 2013 video call requires a unique FQDN to identify the

 requires two FQDNs to place both audio and video calls on Lync using a static route from Lync FE (Front End), the