思科IOS拨号同行:拨号同行搜索

创建以下两个网络电话拨号同行5位数号码以数字开头的11点到两个不同的IP地址代表思科统一通信管理器:Dial-peer声音100 VoIP Destination-pattern 11…偏好1会话目标ipv4:10.1.1.1 Dial-peer声音101 VoIP Destination-pattern 11…偏好2会话目标ipv4: 10.1.1.2许多其他的网络电话拨号对等选项在这里省略了因为我们要关注偏好命令在这个博客。preference命令用于创建基于Cisco IOS中默认的拨号对等点搜索逻辑的呼叫路由层次结构。默认的拨号对等点搜索在思科IOS有以下层次:1。最长匹配(目的地模式)2。优先3。拨号对等点搜索<0-9>全局命令可用于更改拨号对等点搜索算法，可通过以下选项:0最长电话号码匹配、显式偏好、随机选择。1最长的电话号码匹配，明确的偏好，最近最少使用。明确偏好，最长匹配电话号码，随机选择。3 -显式偏好，最长的电话号码匹配，最近最少使用。最近最少的使用，最长的电话号码匹配，明确的偏好。 5—Least recent use, explicit preference, longest match in phone number. 6—Random selection. 7—Least recent use. Dial-peers 100 and 101 have the same longest match against any 5-digit dialed pattern beginning with 11 (11001 as an example). The preference command is configurable as 0 through 10 with the default being a preference of 0. A preference of 0 is the highest priority while a preference of 10 is the lowest priority. Since preference 0 is the dial-peer default, preference 0 will not show up in the running configuration. I used a preference of 1 and 2 in dial peers 100 and 101 so the preference options can clearly be seen in the IOS configuration. Since a preference of 1 is considered to be higher priority than a preference of 2, dial-peer 100 will be used as long as 10.1.1.1 is available. If the CUCM server at 10.1.1.1 does not answer the phone call, the call will be routed to 10.1.1.2. Unfortunately, inbound calls from the PRI (PSTN) will never failover to the redundant CUCM server based on the default H.323 timers. When the provider forwards the Q.931 SETUP message to the customer, the provider starts a T310 timer. If the T310 timer expires before receiving a CALL PROCEEDING message back from the customer, the provider will timeout the call. The T310 timer is normally configured to a value of 10 seconds. The H.323 failover timer is also configured at 10 seconds in the Cisco router. To fix this issue, the following configuration is used: Voice class h323 1 H225 timeout tcp establish 3 ! Dial-peer 100 Voice-class h323 1 ! Dial-peer 101 Voice-class h323 1 Since the H.225 call control layer of H.323 uses TCP port 1720, if the TCP session cannot be established (SYN, SYN/ACK, ACK) to the primary call processing (CUCM) server within 3 seconds, the secondary call processing server will be attempted. In the next blog, we will continue our coverage of dial-peers. REFERENCES Cisco IOS Dial Peer Features http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/dial_peer/dp_confg.html Global Knowledge Cisco Unified Communications classes www.globalknowledge.com/cisco Cisco Press Books – CVOICE / GWGK / TUC http://www.ciscopress.com/markets/detail.asp?st=44706 Cisco Call Manager T310 Tuning http://supportwiki.cisco.com/ViewWiki/index.php/Call_Failure_to_Long_Distance/Mobile_Destination