how to create multiple sip trunks between cucm and cisco unified sip proxy

[nurmawann]

Dear Expert,

Is there a way to create multiple sip trunks between CUCM and Cisco Unified SIP Proxy (CUSP)? How to achieve it without creating multiple IP interfaces on the CUSP module.

CUCM: 8.5.1.10000-9

CUSP: 8.5.2

Thank you,

.wan

[michael-luo]

What's the purpose of doing that?

Thanks!

[Aaron Harrison · Accepted solution]

Hi

Create multiple SIP Security profiles, with different ports configured - that sets a different source port, so you can then add multiple trunks to CUCM.

That assumes that the far end CUSP can have trunks/peers or whatever set up to use the same IP address with different ports.

Aaron

[nurmawann]

Hello Aaron,

Thanks for your suggestion.

I'll check it out.

.wan

[nurmawann]

Hello Michael,

This SIP trunk is part of UCCE solution, which used between CVP, CUSP, and CUCM.

The requirements:

1) To have different codecs for different type of calls, as the phones are at few countries

2) To pass different number of digits from CUSP to CUCM for different call treatments

.wan

[michael-luo]

In my humble opinion,

1) Different codecs can be controlled by regions.  If you put different phones in different regions in CUCM, you should be able to control the codec negotiation with SIP trunk.

2) This can be done on CUSP (router side) with voice translation rules.

Just my two cents.

[nurmawann]

Hello Michael, appreciate your suggestions.

1) Yes, we've done this as a temporary solution.

The drawback is phones at the same location, have two different regions, which makes the ext mob feature inflexible

2) I'll check this out.

Many thanks

.wan