Inbound Dial Peer Matching for Call from CUCM to PSTN

[Yan Tian]

Hi, all

A typical dial peer configuration for H323 PSTN Gateway is as below,

dial-peer voice 1 pots

  incoming called-number .T

dial-peer voice 1000 voip

  destination-pattern 2...T

dial-peer voice 2000 pots

  destination-pattern 9T

For calls from PSTN to CUCM, Inbound dial peer is matching 1 (dial peer ID) and Outbound dial peer is matching 1000 (dial peer ID).
But for Calls from CUCM to PSTN, which dial peer will be matched for Inbound dial peer matching ?
Is there a system default voip dial peer as below which is not explicitly displayed ?

dial-peer voice 0 voip

  incoming called-number .T

Thanks in advance.

[Ayodeji Okanlawon · Accepted solution]

Yes, there is a defualt voip dial-peer (0). The dia-peer that will be matched depends on what the calling number is since you have not defined an incoming called number dial-peer. If your calling number matches 2....T then that dial-peer will be matched. It is best practice to define an inbound dial-peer like this...

dial-peer voice 1 voip

incoming called number .

no vad

dtmf-relay h245-asn (for h323)

dtmf-relay rtp-nte (for sip)

You can refer to this document for more on dial-peer matching

http://www.cisco.com/en/US/tech/tk652/tk90/technologies_tech_note09186a008010fed1.shtml

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[Yan Tian]

Hey aokanlawon,

Thanks for your reply.

1. regarding dial-peer 0, we should have totally 3 default dial-peers (PID: 0) respectively for each protocol (POTS, SIP, H323), am I right ?  If not, how can just 1 default voip dial-peer (PID:0) support both SIP and H323 concurrently ?

2. In your voip dial-peer example above, you did not explicitly specify the protocol (SIP or H323) for that dial peer, how can I determine which protocol this dial peer it supports ? And why you specifiy dtmf-relay for both SIP and H323 without explicitly specify which protocol to use?

3. In the typical configurations of voice GW in production, most voip dial peers do not explicitly specify the protocol to use, do we have a default value for this, such as H323 or SIP ?

Thanks in advance.

[Ayodeji Okanlawon · Accepted solution]

Answers..

1. There is one default dial-peer 0  for voip and it uses the default h323 protocol. There is also a default POTS dial-peer

For you to support sip, you need to define a specific dial-peer for sip..you cant use the default dial-peer and you shouldnt be using it

2. The example was just an example. You will need to configure the protocol to use for each dial-peer..

SIP dial-peer

dial-peer voice 1 voip

session protocol sipv2

dtmf-relay rtp-nte

incoming called number .

no vad

H323 Dial-peer

dial-peer voice 1 voip

incoming called number .

no vad

dtmf-relay h245-asn (for h323)

3. The default protocol is H323. The only time SIP is used is when sip is specified as the protocol

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